139646440 has 32 divisors (see below), whose sum is σ = 317097000. Its totient is φ = 55344384.

The previous prime is 139646431. The next prime is 139646477. The reversal of 139646440 is 44646931.

It can be written as a sum of positive squares in 4 ways, for example, as 77898276 + 61748164 = 8826^2 + 7858^2 .

It is a super-2 number, since 2×139646440² = 39002256409347200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 139646440.

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 7 ways as a sum of consecutive naturals, for example, 11655 + ... + 20374.

Almost surely, 2^139646440 is an apocalyptic number.

139646440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139646440 is an abundant number, since it is smaller than the sum of its proper divisors (177450560).

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

139646440 is a wasteful number, since it uses less digits than its factorization.

139646440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32149 (or 32145 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 139646440 is about 11817.2094844764. The cubic root of 139646440 is about 518.8119326067.

The spelling of 139646440 in words is "one hundred thirty-nine million, six hundred forty-six thousand, four hundred forty".