138943601 has 16 divisors (see below), whose sum is σ = 150718464. Its totient is φ = 127609344.

The previous prime is 138943589. The next prime is 138943603. The reversal of 138943601 is 106349831.

It is not a de Polignac number, because 138943601 - 2⁶ = 138943537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138943603) 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, 127280 + ... + 128366.

It is an arithmetic number, because the mean of its divisors is an integer number (9419904).

Almost surely, 2^138943601 is an apocalyptic number.

It is an amenable number.

138943601 is a deficient number, since it is larger than the sum of its proper divisors (11774863).

138943601 is a wasteful number, since it uses less digits than its factorization.

138943601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 138943601 is about 11787.4340295079. The cubic root of 138943601 is about 517.9400766985.

The spelling of 138943601 in words is "one hundred thirty-eight million, nine hundred forty-three thousand, six hundred one".