138423464 has 8 divisors (see below), whose sum is σ = 259544010. Its totient is φ = 69211728.

The previous prime is 138423449. The next prime is 138423473. The reversal of 138423464 is 464324831.

It can be written as a sum of positive squares in only one way, i.e., 126382564 + 12040900 = 11242^2 + 3470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×138423464² = 38322110771518592, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8651459 + ... + 8651474.

Almost surely, 2^138423464 is an apocalyptic number.

It is an amenable number.

138423464 is a deficient number, since it is larger than the sum of its proper divisors (121120546).

138423464 is a wasteful number, since it uses less digits than its factorization.

138423464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17302939 (or 17302935 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 138423464 is about 11765.3501435359. The cubic root of 138423464 is about 517.2929636163.

The spelling of 138423464 in words is "one hundred thirty-eight million, four hundred twenty-three thousand, four hundred sixty-four".