22402391 has 8 divisors (see below), whose sum is σ = 25501824. Its totient is φ = 19480120.

The previous prime is 22402381. The next prime is 22402399. The reversal of 22402391 is 19320422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22402391 - 2⁶ = 22402327 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22402399) 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, 44021 + ... + 44526.

It is an arithmetic number, because the mean of its divisors is an integer number (3187728).

Almost surely, 2^22402391 is an apocalyptic number.

22402391 is a deficient number, since it is larger than the sum of its proper divisors (3099433).

22402391 is a wasteful number, since it uses less digits than its factorization.

22402391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88581.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 22402391 is about 4733.1164152174. The cubic root of 22402391 is about 281.9019787420.

The spelling of 22402391 in words is "twenty-two million, four hundred two thousand, three hundred ninety-one".