139879540 has 24 divisors (see below), whose sum is σ = 294125832. Its totient is φ = 55879680.

The previous prime is 139879511. The next prime is 139879541. The reversal of 139879540 is 45978931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33500944 + 106378596 = 5788^2 + 10314^2 .

It is a super-2 number, since 2×139879540² = 39132571421223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139879541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13060 + ... + 21220.

It is an arithmetic number, because the mean of its divisors is an integer number (12255243).

Almost surely, 2^139879540 is an apocalyptic number.

139879540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139879540 is an abundant number, since it is smaller than the sum of its proper divisors (154246292).

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

139879540 is a wasteful number, since it uses less digits than its factorization.

139879540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027 (or 9025 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 139879540 is about 11827.0681066780. The cubic root of 139879540 is about 519.1004417753.

The spelling of 139879540 in words is "one hundred thirty-nine million, eight hundred seventy-nine thousand, five hundred forty".