21892438 has 8 divisors (see below), whose sum is σ = 32862888. Its totient is φ = 10938144.

The previous prime is 21892411. The next prime is 21892441. The reversal of 21892438 is 83429812.

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

It is a junction number, because it is equal to n+sod(n) for n = 21892397 and 21892406.

It is a congruent 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, 270 + ... + 6622.

It is an arithmetic number, because the mean of its divisors is an integer number (4107861).

Almost surely, 2^21892438 is an apocalyptic number.

21892438 is a deficient number, since it is larger than the sum of its proper divisors (10970450).

21892438 is a wasteful number, since it uses less digits than its factorization.

21892438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8078.

The product of its digits is 27648, while the sum is 37.

The square root of 21892438 is about 4678.9355627108. The cubic root of 21892438 is about 279.7465308211.

The spelling of 21892438 in words is "twenty-one million, eight hundred ninety-two thousand, four hundred thirty-eight".