15421944 has 16 divisors (see below), whose sum is σ = 38554920. Its totient is φ = 5140640.

The previous prime is 15421943. The next prime is 15421979. The reversal of 15421944 is 44912451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321267 + ... + 321314.

Almost surely, 2^15421944 is an apocalyptic number.

It is an amenable number.

15421944 is an abundant number, since it is smaller than the sum of its proper divisors (23132976).

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

15421944 is a wasteful number, since it uses less digits than its factorization.

15421944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642590 (or 642586 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 15421944 is about 3927.0783032682. The cubic root of 15421944 is about 248.9123092450.

It can be divided in two parts, 1542 and 1944, that added together give a triangular number (3486 = T₈₃).

The spelling of 15421944 in words is "fifteen million, four hundred twenty-one thousand, nine hundred forty-four".