138919628 has 24 divisors (see below), whose sum is σ = 253822800. Its totient is φ = 66443328.

The previous prime is 138919619. The next prime is 138919637. The reversal of 138919628 is 826919831.

It is an interprime number because it is at equal distance from previous prime (138919619) and next prime (138919637).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7151 + ... + 18137.

It is an arithmetic number, because the mean of its divisors is an integer number (10575950).

Almost surely, 2^138919628 is an apocalyptic number.

It is an amenable number.

138919628 is a deficient number, since it is larger than the sum of its proper divisors (114903172).

138919628 is a wasteful number, since it uses less digits than its factorization.

138919628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11129 (or 11127 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 138919628 is about 11786.4170976595. The cubic root of 138919628 is about 517.9102869335.

The spelling of 138919628 in words is "one hundred thirty-eight million, nine hundred nineteen thousand, six hundred twenty-eight".