140721840 has 320 divisors, whose sum is σ = 569963520. Its totient is φ = 31242240.

The previous prime is 140721829. The next prime is 140721851. The reversal of 140721840 is 48127041.

140721840 is a `hidden beast` number, since 1 + 407 + 218 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (140721829) and next prime (140721851).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 619807 + ... + 620033.

It is an arithmetic number, because the mean of its divisors is an integer number (1781136).

Almost surely, 2^140721840 is an apocalyptic number.

140721840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 140721840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284981760).

140721840 is an abundant number, since it is smaller than the sum of its proper divisors (429241680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

140721840 is a wasteful number, since it uses less digits than its factorization.

140721840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 140721840 is about 11862.6236558360. The cubic root of 140721840 is about 520.1402974497.

Adding to 140721840 its reverse (48127041), we get a palindrome (188848881).

It can be divided in two parts, 1407 and 21840, that multiplied together give a triangular number (30728880 = T₇₈₃₉).

The spelling of 140721840 in words is "one hundred forty million, seven hundred twenty-one thousand, eight hundred forty".