138897250 has 16 divisors (see below), whose sum is σ = 260016120. Its totient is φ = 55558800.

The previous prime is 138897197. The next prime is 138897257. The reversal of 138897250 is 52798831.

It can be written as a sum of positive squares in 4 ways, for example, as 48818169 + 90079081 = 6987^2 + 9491^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138897197 and 138897206.

It is not an unprimeable number, because it can be changed into a prime (138897257) by changing a digit.

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, 277545 + ... + 278044.

Almost surely, 2^138897250 is an apocalyptic number.

138897250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138897250 is a deficient number, since it is larger than the sum of its proper divisors (121118870).

138897250 is an equidigital number, since it uses as much as digits as its factorization.

138897250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555606 (or 555596 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 138897250 is about 11785.4677463391. The cubic root of 138897250 is about 517.8824760836.

The spelling of 138897250 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, two hundred fifty".