15378138 has 24 divisors (see below), whose sum is σ = 33415200. Its totient is φ = 5111304.

The previous prime is 15378131. The next prime is 15378179. The reversal of 15378138 is 83187351.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (15378131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6523 + ... + 8561.

It is an arithmetic number, because the mean of its divisors is an integer number (1392300).

Almost surely, 2^15378138 is an apocalyptic number.

15378138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15378138 is an abundant number, since it is smaller than the sum of its proper divisors (18037062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15378138 is a wasteful number, since it uses less digits than its factorization.

15378138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466 (or 2463 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 15378138 is about 3921.4969080697. The cubic root of 15378138 is about 248.6764074446.

The spelling of 15378138 in words is "fifteen million, three hundred seventy-eight thousand, one hundred thirty-eight".