138577945 has 16 divisors (see below), whose sum is σ = 181641600. Its totient is φ = 100656000.

The previous prime is 138577937. The next prime is 138577969. The reversal of 138577945 is 549775831.

It is a happy number.

It is not a de Polignac number, because 138577945 - 2³ = 138577937 is a prime.

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, 76045 + ... + 77845.

It is an arithmetic number, because the mean of its divisors is an integer number (11352600).

Almost surely, 2^138577945 is an apocalyptic number.

It is an amenable number.

138577945 is a deficient number, since it is larger than the sum of its proper divisors (43063655).

138577945 is a wasteful number, since it uses less digits than its factorization.

138577945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3216.

The product of its digits is 1058400, while the sum is 49.

The square root of 138577945 is about 11771.9133958758. The cubic root of 138577945 is about 517.4853255736.

The spelling of 138577945 in words is "one hundred thirty-eight million, five hundred seventy-seven thousand, nine hundred forty-five".