140121720 has 48 divisors (see below), whose sum is σ = 455396760. Its totient is φ = 37365696.

The previous prime is 140121719. The next prime is 140121721. The reversal of 140121720 is 27121041.

It is an interprime number because it is at equal distance from previous prime (140121719) and next prime (140121721).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 140121693 and 140121702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140121721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194254 + ... + 194973.

Almost surely, 2^140121720 is an apocalyptic number.

140121720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140121720 is an abundant number, since it is smaller than the sum of its proper divisors (315275040).

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

140121720 is a wasteful number, since it uses less digits than its factorization.

140121720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389244 (or 389237 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 140121720 is about 11837.3020574791. The cubic root of 140121720 is about 519.3998500189.

Adding to 140121720 its reverse (27121041), we get a palindrome (167242761).

The spelling of 140121720 in words is "one hundred forty million, one hundred twenty-one thousand, seven hundred twenty".