15421913 has 8 divisors (see below), whose sum is σ = 16697856. Its totient is φ = 14158800.

The previous prime is 15421897. The next prime is 15421921. The reversal of 15421913 is 31912451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15421913 - 2⁴ = 15421897 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 623 + ... + 5588.

It is an arithmetic number, because the mean of its divisors is an integer number (2087232).

Almost surely, 2^15421913 is an apocalyptic number.

15421913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

15421913 is a deficient number, since it is larger than the sum of its proper divisors (1275943).

15421913 is a wasteful number, since it uses less digits than its factorization.

15421913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415.

The product of its digits is 1080, while the sum is 26.

The square root of 15421913 is about 3927.0743563116. The cubic root of 15421913 is about 248.9121424634.

The spelling of 15421913 in words is "fifteen million, four hundred twenty-one thousand, nine hundred thirteen".