15421056 has 64 divisors (see below), whose sum is σ = 46822080. Its totient is φ = 4405248.

The previous prime is 15421033. The next prime is 15421061. The reversal of 15421056 is 65012451.

It is a tau number, because it is divible by the number of its divisors (64).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181 + ... + 5556.

It is an arithmetic number, because the mean of its divisors is an integer number (731595).

Almost surely, 2^15421056 is an apocalyptic number.

15421056 is a gapful number since it is divisible by the number (16) 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 15421056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23411040).

15421056 is an abundant number, since it is smaller than the sum of its proper divisors (31401024).

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

15421056 is an equidigital number, since it uses as much as digits as its factorization.

15421056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5761 (or 5749 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 15421056 is about 3926.9652404879. The cubic root of 15421056 is about 248.9075316723.

The spelling of 15421056 in words is "fifteen million, four hundred twenty-one thousand, fifty-six".