138623814 has 48 divisors (see below), whose sum is σ = 363456288. Its totient is φ = 37276416.

The previous prime is 138623809. The next prime is 138623833. The reversal of 138623814 is 418326831.

138623814 is a `hidden beast` number, since 13 + 8 + 623 + 8 + 14 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30217 + ... + 34500.

It is an arithmetic number, because the mean of its divisors is an integer number (7572006).

Almost surely, 2^138623814 is an apocalyptic number.

138623814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138623814 is an abundant number, since it is smaller than the sum of its proper divisors (224832474).

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

138623814 is a wasteful number, since it uses less digits than its factorization.

138623814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64749 (or 64746 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 138623814 is about 11773.8614736203. The cubic root of 138623814 is about 517.5424147830.

It can be divided in two parts, 1386 and 23814, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 138623814 in words is "one hundred thirty-eight million, six hundred twenty-three thousand, eight hundred fourteen".