138459408 has 20 divisors (see below), whose sum is σ = 357686928. Its totient is φ = 46153120.

The previous prime is 138459383. The next prime is 138459421. The reversal of 138459408 is 804954831.

It is a self number, because there is not a number n which added to its sum of digits gives 138459408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442238 + ... + 1442333.

Almost surely, 2^138459408 is an apocalyptic number.

It is an amenable number.

138459408 is an abundant number, since it is smaller than the sum of its proper divisors (219227520).

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

138459408 is a wasteful number, since it uses less digits than its factorization.

138459408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884582 (or 2884576 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 138459408 is about 11766.8775807348. The cubic root of 138459408 is about 517.3377343717.

The spelling of 138459408 in words is "one hundred thirty-eight million, four hundred fifty-nine thousand, four hundred eight".