138445645 has 12 divisors (see below), whose sum is σ = 179898516. Its totient is φ = 102236160.

The previous prime is 138445639. The next prime is 138445667. The reversal of 138445645 is 546544831.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2350089 + 136095556 = 1533^2 + 11666^2 .

It is not a de Polignac number, because 138445645 - 2¹⁵ = 138412877 is a prime.

It is a super-3 number, since 3×138445645³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138445598 and 138445607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81076 + ... + 82765.

It is an arithmetic number, because the mean of its divisors is an integer number (14991543).

Almost surely, 2^138445645 is an apocalyptic number.

It is an amenable number.

138445645 is a deficient number, since it is larger than the sum of its proper divisors (41452871).

138445645 is a wasteful number, since it uses less digits than its factorization.

138445645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163872 (or 163859 counting only the distinct ones).

The product of its digits is 230400, while the sum is 40.

The square root of 138445645 is about 11766.2927466556. The cubic root of 138445645 is about 517.3205925122.

The spelling of 138445645 in words is "one hundred thirty-eight million, four hundred forty-five thousand, six hundred forty-five".