15421394 has 8 divisors (see below), whose sum is σ = 23156940. Its totient is φ = 7702416.

The previous prime is 15421379. The next prime is 15421409. The reversal of 15421394 is 49312451.

It is an interprime number because it is at equal distance from previous prime (15421379) and next prime (15421409).

It can be written as a sum of positive squares in 2 ways, for example, as 15015625 + 405769 = 3875^2 + 637^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469 + ... + 5744.

Almost surely, 2^15421394 is an apocalyptic number.

15421394 is a deficient number, since it is larger than the sum of its proper divisors (7735546).

15421394 is a wasteful number, since it uses less digits than its factorization.

15421394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284.

The product of its digits is 4320, while the sum is 29.

The square root of 15421394 is about 3927.0082760290. The cubic root of 15421394 is about 248.9093501844.

The spelling of 15421394 in words is "fifteen million, four hundred twenty-one thousand, three hundred ninety-four".