138865000 has 40 divisors (see below), whose sum is σ = 325372410. Its totient is φ = 55544000.

The previous prime is 138864983. The next prime is 138865037. The reversal of 138865000 is 568831.

It can be written as a sum of positive squares in 5 ways, for example, as 4351396 + 134513604 = 2086^2 + 11598^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8887 + ... + 18886.

Almost surely, 2^138865000 is an apocalyptic number.

138865000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138865000 is an abundant number, since it is smaller than the sum of its proper divisors (186507410).

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

138865000 is an equidigital number, since it uses as much as digits as its factorization.

138865000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27799 (or 27780 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 138865000 is about 11784.0994564710. The cubic root of 138865000 is about 517.8423912903.

The spelling of 138865000 in words is "one hundred thirty-eight million, eight hundred sixty-five thousand".