22391964 has 84 divisors (see below), whose sum is σ = 67206384. Its totient is φ = 6391872.

The previous prime is 22391959. The next prime is 22391969. The reversal of 22391964 is 46919322.

It is an interprime number because it is at equal distance from previous prime (22391959) and next prime (22391969).

It is a tau number, because it is divible by the number of its divisors (84).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22391969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 19864 + ... + 20960.

It is an arithmetic number, because the mean of its divisors is an integer number (800076).

Almost surely, 2^22391964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22391964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33603192).

22391964 is an abundant number, since it is smaller than the sum of its proper divisors (44814420).

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

22391964 is a wasteful number, since it uses less digits than its factorization.

22391964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126 (or 1109 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 22391964 is about 4732.0147928763. The cubic root of 22391964 is about 281.8582356718.

The spelling of 22391964 in words is "twenty-two million, three hundred ninety-one thousand, nine hundred sixty-four".