21983862 has 16 divisors (see below), whose sum is σ = 44404272. Its totient is φ = 7255200.

The previous prime is 21983861. The next prime is 21983869. The reversal of 21983862 is 26838912.

It is a happy number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 21983862.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17533 + ... + 18744.

It is an arithmetic number, because the mean of its divisors is an integer number (2775267).

Almost surely, 2^21983862 is an apocalyptic number.

21983862 is an abundant number, since it is smaller than the sum of its proper divisors (22420410).

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

21983862 is a wasteful number, since it uses less digits than its factorization.

21983862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36383.

The product of its digits is 41472, while the sum is 39.

The square root of 21983862 is about 4688.6951276448. The cubic root of 21983862 is about 280.1354021988.

The spelling of 21983862 in words is "twenty-one million, nine hundred eighty-three thousand, eight hundred sixty-two".