15421087 has 6 divisors (see below), whose sum is σ = 16950584. Its totient is φ = 14019060.

The previous prime is 15421061. The next prime is 15421093. The reversal of 15421087 is 78012451.

It is a de Polignac number, because none of the positive numbers 2^k-15421087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63603 + ... + 63844.

Almost surely, 2^15421087 is an apocalyptic number.

15421087 is a deficient number, since it is larger than the sum of its proper divisors (1529497).

15421087 is a wasteful number, since it uses less digits than its factorization.

15421087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127469 (or 127458 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 15421087 is about 3926.9691875542. The cubic root of 15421087 is about 248.9076984600.

The spelling of 15421087 in words is "fifteen million, four hundred twenty-one thousand, eighty-seven".