138784974 has 16 divisors (see below), whose sum is σ = 293897808. Its totient is φ = 43540352.

The previous prime is 138784931. The next prime is 138784979. The reversal of 138784974 is 479487831.

It is a super-2 number, since 2×138784974² = 38522538016361352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138784979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680217 + ... + 680420.

It is an arithmetic number, because the mean of its divisors is an integer number (18368613).

Almost surely, 2^138784974 is an apocalyptic number.

138784974 is an abundant number, since it is smaller than the sum of its proper divisors (155112834).

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

138784974 is a wasteful number, since it uses less digits than its factorization.

138784974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360659.

The product of its digits is 1354752, while the sum is 51.

The square root of 138784974 is about 11780.7034594713. The cubic root of 138784974 is about 517.7428970133.

The spelling of 138784974 in words is "one hundred thirty-eight million, seven hundred eighty-four thousand, nine hundred seventy-four".