138451952 has 20 divisors (see below), whose sum is σ = 276904896. Its totient is φ = 66992640.

The previous prime is 138451939. The next prime is 138451967. The reversal of 138451952 is 259154831.

It is a happy number.

138451952 is an admirable number.

It is a super-2 number, since 2×138451952² = 38337886025220608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139073 + ... + 140064.

Almost surely, 2^138451952 is an apocalyptic number.

It is an amenable number.

138451952 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138451952 is a wasteful number, since it uses less digits than its factorization.

138451952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279176 (or 279170 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 138451952 is about 11766.5607549530. The cubic root of 138451952 is about 517.3284480414.

The spelling of 138451952 in words is "one hundred thirty-eight million, four hundred fifty-one thousand, nine hundred fifty-two".