15421390 has 16 divisors (see below), whose sum is σ = 28174032. Its totient is φ = 6076224.

The previous prime is 15421379. The next prime is 15421409. The reversal of 15421390 is 9312451.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10839 + ... + 12178.

It is an arithmetic number, because the mean of its divisors is an integer number (1760877).

Almost surely, 2^15421390 is an apocalyptic number.

15421390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15421390 is a deficient number, since it is larger than the sum of its proper divisors (12752642).

15421390 is a wasteful number, since it uses less digits than its factorization.

15421390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23091.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 15421390 is about 3927.0077667354. The cubic root of 15421390 is about 248.9093286637.

The spelling of 15421390 in words is "fifteen million, four hundred twenty-one thousand, three hundred ninety".