139002540 has 48 divisors (see below), whose sum is σ = 412104672. Its totient is φ = 34886656.

The previous prime is 139002533. The next prime is 139002569. The reversal of 139002540 is 45200931.

It is a super-2 number, since 2×139002540² = 38643412252903200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139002540.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67119 + ... + 69158.

It is an arithmetic number, because the mean of its divisors is an integer number (8585514).

Almost surely, 2^139002540 is an apocalyptic number.

139002540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139002540 is an abundant number, since it is smaller than the sum of its proper divisors (273102132).

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

139002540 is a wasteful number, since it uses less digits than its factorization.

139002540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136306 (or 136304 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 139002540 is about 11789.9338420536. The cubic root of 139002540 is about 518.0133019845.

The spelling of 139002540 in words is "one hundred thirty-nine million, two thousand, five hundred forty".