138456534 has 32 divisors (see below), whose sum is σ = 308638080. Its totient is φ = 41150592.

The previous prime is 138456523. The next prime is 138456569. The reversal of 138456534 is 435654831.

It is a junction number, because it is equal to n+sod(n) for n = 138456492 and 138456501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33784 + ... + 37659.

It is an arithmetic number, because the mean of its divisors is an integer number (9644940).

Almost surely, 2^138456534 is an apocalyptic number.

138456534 is an abundant number, since it is smaller than the sum of its proper divisors (170181546).

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

138456534 is a wasteful number, since it uses less digits than its factorization.

138456534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71484.

The product of its digits is 172800, while the sum is 39.

The square root of 138456534 is about 11766.7554576442. The cubic root of 138456534 is about 517.3341548896.

The spelling of 138456534 in words is "one hundred thirty-eight million, four hundred fifty-six thousand, five hundred thirty-four".