21892738 has 16 divisors (see below), whose sum is σ = 38825280. Its totient is φ = 9058896.

The previous prime is 21892723. The next prime is 21892747. The reversal of 21892738 is 83729812.

It is a self number, because there is not a number n which added to its sum of digits gives 21892738.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26556 + ... + 27367.

It is an arithmetic number, because the mean of its divisors is an integer number (2426580).

Almost surely, 2^21892738 is an apocalyptic number.

21892738 is a deficient number, since it is larger than the sum of its proper divisors (16932542).

21892738 is a wasteful number, since it uses less digits than its factorization.

21892738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53961.

The product of its digits is 48384, while the sum is 40.

The square root of 21892738 is about 4678.9676211746. The cubic root of 21892738 is about 279.7478086379.

The spelling of 21892738 in words is "twenty-one million, eight hundred ninety-two thousand, seven hundred thirty-eight".