15212230440 has 128 divisors (see below), whose sum is σ = 50009702400. Its totient is φ = 3671205120.

The previous prime is 15212230427. The next prime is 15212230477. The reversal of 15212230440 is 4403221251.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 15212230440.

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, 268521 + ... + 320199.

It is an arithmetic number, because the mean of its divisors is an integer number (390700800).

Almost surely, 2^15212230440 is an apocalyptic number.

15212230440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15212230440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25004851200).

15212230440 is an abundant number, since it is smaller than the sum of its proper divisors (34797471960).

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

15212230440 is a wasteful number, since it uses less digits than its factorization.

15212230440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51927 (or 51923 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 15212230440 its reverse (4403221251), we get a palindrome (19615451691).

The spelling of 15212230440 in words is "fifteen billion, two hundred twelve million, two hundred thirty thousand, four hundred forty".