15420812 has 24 divisors (see below), whose sum is σ = 29849232. Its totient is φ = 6912000.

The previous prime is 15420803. The next prime is 15420817. The reversal of 15420812 is 21802451.

It is not an unprimeable number, because it can be changed into a prime (15420817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812 + ... + 5612.

It is an arithmetic number, because the mean of its divisors is an integer number (1243718).

Almost surely, 2^15420812 is an apocalyptic number.

It is an amenable number.

15420812 is a deficient number, since it is larger than the sum of its proper divisors (14428420).

15420812 is a wasteful number, since it uses less digits than its factorization.

15420812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4889 (or 4887 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 15420812 is about 3926.9341731178. The cubic root of 15420812 is about 248.9062188838.

The spelling of 15420812 in words is "fifteen million, four hundred twenty thousand, eight hundred twelve".