139043640 has 64 divisors (see below), whose sum is σ = 418298400. Its totient is φ = 36974592.

The previous prime is 139043633. The next prime is 139043647. The reversal of 139043640 is 46340931.

It is an interprime number because it is at equal distance from previous prime (139043633) and next prime (139043647).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 139043598 and 139043607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139043647) 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, 47664 + ... + 50496.

Almost surely, 2^139043640 is an apocalyptic number.

139043640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139043640 is an abundant number, since it is smaller than the sum of its proper divisors (279254760).

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

139043640 is a wasteful number, since it uses less digits than its factorization.

139043640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3256 (or 3252 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 139043640 is about 11791.6767255552. The cubic root of 139043640 is about 518.0643520077.

The spelling of 139043640 in words is "one hundred thirty-nine million, forty-three thousand, six hundred forty".