1515015138 has 64 divisors (see below), whose sum is σ = 3771290880. Its totient is φ = 395062272.

The previous prime is 1515015127. The next prime is 1515015181. The reversal of 1515015138 is 8315105151.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33006 + ... + 64182.

It is an arithmetic number, because the mean of its divisors is an integer number (58926420).

Almost surely, 2^1515015138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1515015138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1885645440).

1515015138 is an abundant number, since it is smaller than the sum of its proper divisors (2256275742).

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

1515015138 is a wasteful number, since it uses less digits than its factorization.

1515015138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31291.

The product of its (nonzero) digits is 3000, while the sum is 30.

The square root of 1515015138 is about 38923.1953724254. The cubic root of 1515015138 is about 1148.5211331877.

The spelling of 1515015138 in words is "one billion, five hundred fifteen million, fifteen thousand, one hundred thirty-eight".