138620445 has 16 divisors (see below), whose sum is σ = 221942592. Its totient is φ = 73880960.

The previous prime is 138620413. The next prime is 138620453. The reversal of 138620445 is 544026831.

It is not a de Polignac number, because 138620445 - 2⁵ = 138620413 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 34249 + ... + 38081.

It is an arithmetic number, because the mean of its divisors is an integer number (13871412).

Almost surely, 2^138620445 is an apocalyptic number.

138620445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138620445 is a deficient number, since it is larger than the sum of its proper divisors (83322147).

138620445 is a wasteful number, since it uses less digits than its factorization.

138620445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6252.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 138620445 is about 11773.7184015926. The cubic root of 138620445 is about 517.5382221063.

The spelling of 138620445 in words is "one hundred thirty-eight million, six hundred twenty thousand, four hundred forty-five".