12315990 has 128 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 2764800.

The previous prime is 12315967. The next prime is 12315991. The reversal of 12315990 is 9951321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 300370 + ... + 300410.

It is an arithmetic number, because the mean of its divisors is an integer number (272160).

Almost surely, 2^12315990 is an apocalyptic number.

12315990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12315990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17418240).

12315990 is an abundant number, since it is smaller than the sum of its proper divisors (22520490).

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

12315990 is a wasteful number, since it uses less digits than its factorization.

12315990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 12315990 is about 3509.4144810780. The cubic root of 12315990 is about 230.9350091713.

The spelling of 12315990 in words is "twelve million, three hundred fifteen thousand, nine hundred ninety".