138556005 has 32 divisors (see below), whose sum is σ = 253913088. Its totient is φ = 63201600.

The previous prime is 138555983. The next prime is 138556021. The reversal of 138556005 is 500655831.

It is not a de Polignac number, because 138556005 - 2¹¹ = 138553957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58800 + ... + 61110.

It is an arithmetic number, because the mean of its divisors is an integer number (7934784).

Almost surely, 2^138556005 is an apocalyptic number.

138556005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138556005 is a deficient number, since it is larger than the sum of its proper divisors (115357083).

138556005 is a wasteful number, since it uses less digits than its factorization.

138556005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 138556005 is about 11770.9814798937. The cubic root of 138556005 is about 517.4580142837.

The spelling of 138556005 in words is "one hundred thirty-eight million, five hundred fifty-six thousand, five".