22400931 has 16 divisors (see below), whose sum is σ = 34317824. Its totient is φ = 12731904.

The previous prime is 22400929. The next prime is 22400933. The reversal of 22400931 is 13900422.

It is an interprime number because it is at equal distance from previous prime (22400929) and next prime (22400933).

It is not a de Polignac number, because 22400931 - 2¹ = 22400929 is a prime.

It is a super-2 number, since 2×22400931² = 1003603419333522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22400898 and 22400907.

It is not an unprimeable number, because it can be changed into a prime (22400933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1290 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (2144864).

Almost surely, 2^22400931 is an apocalyptic number.

22400931 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22400931 is a deficient number, since it is larger than the sum of its proper divisors (11916893).

22400931 is a wasteful number, since it uses less digits than its factorization.

22400931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5730.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 22400931 is about 4732.9621802841. The cubic root of 22400931 is about 281.8958546065.

The spelling of 22400931 in words is "twenty-two million, four hundred thousand, nine hundred thirty-one".