138884645 has 16 divisors (see below), whose sum is σ = 179800560. Its totient is φ = 102595584.

The previous prime is 138884597. The next prime is 138884657. The reversal of 138884645 is 546488831.

It can be written as a sum of positive squares in 8 ways, for example, as 22287841 + 116596804 = 4721^2 + 10798^2 .

It is a cyclic number.

It is not a de Polignac number, because 138884645 - 2¹² = 138880549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138884645.

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, 10910 + ... + 19919.

It is an arithmetic number, because the mean of its divisors is an integer number (11237535).

Almost surely, 2^138884645 is an apocalyptic number.

It is an amenable number.

138884645 is a deficient number, since it is larger than the sum of its proper divisors (40915915).

138884645 is a wasteful number, since it uses less digits than its factorization.

138884645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30904.

The product of its digits is 737280, while the sum is 47.

The square root of 138884645 is about 11784.9329654436. The cubic root of 138884645 is about 517.8668095721.

The spelling of 138884645 in words is "one hundred thirty-eight million, eight hundred eighty-four thousand, six hundred forty-five".