138644501 has 16 divisors (see below), whose sum is σ = 150543360. Its totient is φ = 127263600.

The previous prime is 138644497. The next prime is 138644509. The reversal of 138644501 is 105446831.

It is a cyclic number.

It is not a de Polignac number, because 138644501 - 2² = 138644497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138644509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94826 + ... + 96276.

It is an arithmetic number, because the mean of its divisors is an integer number (9408960).

Almost surely, 2^138644501 is an apocalyptic number.

It is an amenable number.

138644501 is a deficient number, since it is larger than the sum of its proper divisors (11898859).

138644501 is a wasteful number, since it uses less digits than its factorization.

138644501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 138644501 is about 11774.7399546657. The cubic root of 138644501 is about 517.5681579967.

The spelling of 138644501 in words is "one hundred thirty-eight million, six hundred forty-four thousand, five hundred one".