15315012 has 18 divisors (see below), whose sum is σ = 38713038. Its totient is φ = 5104992.

The previous prime is 15314989. The next prime is 15315029. The reversal of 15315012 is 21051351.

It can be written as a sum of positive squares in only one way, i.e., 11128896 + 4186116 = 3336^2 + 2046^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212673 + ... + 212744.

Almost surely, 2^15315012 is an apocalyptic number.

15315012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15315012 is an abundant number, since it is smaller than the sum of its proper divisors (23398026).

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

15315012 is a wasteful number, since it uses less digits than its factorization.

15315012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425427 (or 425422 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 15315012 is about 3913.4399190482. The cubic root of 15315012 is about 248.3356753479.

Adding to 15315012 its reverse (21051351), we get a palindrome (36366363).

The spelling of 15315012 in words is "fifteen million, three hundred fifteen thousand, twelve".