140643918 has 32 divisors (see below), whose sum is σ = 317673120. Its totient is φ = 46111680.

The previous prime is 140643911. The next prime is 140643929. The reversal of 140643918 is 819346041.

140643918 is a `hidden beast` number, since 1 + 4 + 0 + 643 + 9 + 1 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140643911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18055 + ... + 24642.

It is an arithmetic number, because the mean of its divisors is an integer number (9927285).

Almost surely, 2^140643918 is an apocalyptic number.

140643918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

140643918 is an abundant number, since it is smaller than the sum of its proper divisors (177029202).

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

140643918 is a wasteful number, since it uses less digits than its factorization.

140643918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42769 (or 42763 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 140643918 is about 11859.3388517236. The cubic root of 140643918 is about 520.0442738437.

Adding to 140643918 its reverse (819346041), we get a palindrome (959989959).

The spelling of 140643918 in words is "one hundred forty million, six hundred forty-three thousand, nine hundred eighteen".