15421457 has 8 divisors (see below), whose sum is σ = 15721056. Its totient is φ = 15124032.

The previous prime is 15421447. The next prime is 15421487. The reversal of 15421457 is 75412451.

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 15421457 - 2¹² = 15417361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15421447) 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, 22238 + ... + 22920.

It is an arithmetic number, because the mean of its divisors is an integer number (1965132).

Almost surely, 2^15421457 is an apocalyptic number.

It is an amenable number.

15421457 is a deficient number, since it is larger than the sum of its proper divisors (299599).

15421457 is an equidigital number, since it uses as much as digits as its factorization.

15421457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087.

The product of its digits is 5600, while the sum is 29.

The square root of 15421457 is about 3927.0162973942. The cubic root of 15421457 is about 248.9096891349.

The spelling of 15421457 in words is "fifteen million, four hundred twenty-one thousand, four hundred fifty-seven".