21838874 has 8 divisors (see below), whose sum is σ = 32782260. Its totient is φ = 10911456.

The previous prime is 21838867. The next prime is 21838889. The reversal of 21838874 is 47883812.

It can be written as a sum of positive squares in 2 ways, for example, as 19864849 + 1974025 = 4457^2 + 1405^2 .

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

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, 392 + ... + 6620.

Almost surely, 2^21838874 is an apocalyptic number.

21838874 is a deficient number, since it is larger than the sum of its proper divisors (10943386).

21838874 is a wasteful number, since it uses less digits than its factorization.

21838874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7984.

The product of its digits is 86016, while the sum is 41.

The square root of 21838874 is about 4673.2081057877. The cubic root of 21838874 is about 279.5181935219.

The spelling of 21838874 in words is "twenty-one million, eight hundred thirty-eight thousand, eight hundred seventy-four".