138251936 has 12 divisors (see below), whose sum is σ = 272183562. Its totient is φ = 69125952.

The previous prime is 138251933. The next prime is 138251941. The reversal of 138251936 is 639152831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 138203536 + 48400 = 11756^2 + 220^2 .

It is a super-2 number, since 2×138251936² = 38227195615496192, 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 138251936.

It is not an unprimeable number, because it can be changed into a prime (138251933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2160155 + ... + 2160218.

Almost surely, 2^138251936 is an apocalyptic number.

138251936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138251936 is a deficient number, since it is larger than the sum of its proper divisors (133931626).

138251936 is an equidigital number, since it uses as much as digits as its factorization.

138251936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320383 (or 4320375 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 138251936 is about 11758.0583431109. The cubic root of 138251936 is about 517.0792067375.

The spelling of 138251936 in words is "one hundred thirty-eight million, two hundred fifty-one thousand, nine hundred thirty-six".