138401515 has 32 divisors (see below), whose sum is σ = 197222400. Its totient is φ = 91238400.

The previous prime is 138401513. The next prime is 138401561. The reversal of 138401515 is 515104831.

It is not a de Polignac number, because 138401515 - 2¹ = 138401513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138401513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215595 + ... + 216235.

It is an arithmetic number, because the mean of its divisors is an integer number (6163200).

Almost surely, 2^138401515 is an apocalyptic number.

138401515 is a deficient number, since it is larger than the sum of its proper divisors (58820885).

138401515 is a wasteful number, since it uses less digits than its factorization.

138401515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 138401515 is about 11764.4173251377. The cubic root of 138401515 is about 517.2656207967.

The spelling of 138401515 in words is "one hundred thirty-eight million, four hundred one thousand, five hundred fifteen".