22391940 has 24 divisors (see below), whose sum is σ = 62697600. Its totient is φ = 5971168.

The previous prime is 22391933. The next prime is 22391959. The reversal of 22391940 is 4919322.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22391898 and 22391907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186540 + ... + 186659.

It is an arithmetic number, because the mean of its divisors is an integer number (2612400).

Almost surely, 2^22391940 is an apocalyptic number.

22391940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22391940 is an abundant number, since it is smaller than the sum of its proper divisors (40305660).

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

22391940 is a wasteful number, since it uses less digits than its factorization.

22391940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373211 (or 373209 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 22391940 is about 4732.0122569579. The cubic root of 22391940 is about 281.8581349719.

The spelling of 22391940 in words is "twenty-two million, three hundred ninety-one thousand, nine hundred forty".