21840376 has 16 divisors (see below), whose sum is σ = 43359840. Its totient is φ = 10277760.

The previous prime is 21840361. The next prime is 21840389. The reversal of 21840376 is 67304812.

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, 80160 + ... + 80431.

It is an arithmetic number, because the mean of its divisors is an integer number (2709990).

Almost surely, 2^21840376 is an apocalyptic number.

It is an amenable number.

21840376 is a deficient number, since it is larger than the sum of its proper divisors (21519464).

21840376 is a wasteful number, since it uses less digits than its factorization.

21840376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160614 (or 160610 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21840376 is about 4673.3688063323. The cubic root of 21840376 is about 279.5246014638.

The spelling of 21840376 in words is "twenty-one million, eight hundred forty thousand, three hundred seventy-six".