21892458 has 64 divisors (see below), whose sum is σ = 52918272. Its totient is φ = 5903040.

The previous prime is 21892441. The next prime is 21892469. The reversal of 21892458 is 85429812.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126460 + ... + 126632.

It is an arithmetic number, because the mean of its divisors is an integer number (826848).

Almost surely, 2^21892458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21892458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26459136).

21892458 is an abundant number, since it is smaller than the sum of its proper divisors (31025814).

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

21892458 is a wasteful number, since it uses less digits than its factorization.

21892458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its digits is 46080, while the sum is 39.

The square root of 21892458 is about 4678.9376999486. The cubic root of 21892458 is about 279.7466160092.

The spelling of 21892458 in words is "twenty-one million, eight hundred ninety-two thousand, four hundred fifty-eight".