138344645 has 16 divisors (see below), whose sum is σ = 174564720. Its totient is φ = 105100800.

The previous prime is 138344639. The next prime is 138344669. The reversal of 138344645 is 546443831.

It is a happy number.

It is a Cunningham number, because it is equal to 11762²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 138344644 = 1^2 + 11762^2 .

It is not a de Polignac number, because 138344645 - 2¹⁴ = 138328261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138344599 and 138344608.

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, 1025 + ... + 16665.

It is an arithmetic number, because the mean of its divisors is an integer number (10910295).

Almost surely, 2^138344645 is an apocalyptic number.

It is an amenable number.

138344645 is a deficient number, since it is larger than the sum of its proper divisors (36220075).

138344645 is a wasteful number, since it uses less digits than its factorization.

138344645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15736.

The product of its digits is 138240, while the sum is 38.

The square root of 138344645 is about 11762.0000425098. Note that the first 4 decimals coincide. The cubic root of 138344645 is about 517.1947619241.

The spelling of 138344645 in words is "one hundred thirty-eight million, three hundred forty-four thousand, six hundred forty-five".