138420932 has 24 divisors (see below), whose sum is σ = 263189976. Its totient is φ = 63318528.

The previous prime is 138420929. The next prime is 138420977. The reversal of 138420932 is 239024831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31629376 + 106791556 = 5624^2 + 10334^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5903 + ... + 17654.

It is an arithmetic number, because the mean of its divisors is an integer number (10966249).

Almost surely, 2^138420932 is an apocalyptic number.

It is an amenable number.

138420932 is a deficient number, since it is larger than the sum of its proper divisors (124769044).

138420932 is a wasteful number, since it uses less digits than its factorization.

138420932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23687 (or 23685 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 138420932 is about 11765.2425389365. The cubic root of 138420932 is about 517.2898095418.

The spelling of 138420932 in words is "one hundred thirty-eight million, four hundred twenty thousand, nine hundred thirty-two".