15421842 has 24 divisors (see below), whose sum is σ = 33543900. Its totient is φ = 5120640.

The previous prime is 15421817. The next prime is 15421843. The reversal of 15421842 is 24812451.

15421842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15139881 + 281961 = 3891^2 + 531^2 .

It is not an unprimeable number, because it can be changed into a prime (15421843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3534 + ... + 6582.

Almost surely, 2^15421842 is an apocalyptic number.

15421842 is an abundant number, since it is smaller than the sum of its proper divisors (18122058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15421842 is a wasteful number, since it uses less digits than its factorization.

15421842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338 (or 3335 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 15421842 is about 3927.0653164927. The cubic root of 15421842 is about 248.9117604791.

The spelling of 15421842 in words is "fifteen million, four hundred twenty-one thousand, eight hundred forty-two".