22491379 has 4 divisors (see below), whose sum is σ = 22776160. Its totient is φ = 22206600.

The previous prime is 22491367. The next prime is 22491409. The reversal of 22491379 is 97319422.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22491379 - 2⁵ = 22491347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22491479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142272 + ... + 142429.

It is an arithmetic number, because the mean of its divisors is an integer number (5694040).

Almost surely, 2^22491379 is an apocalyptic number.

22491379 is a deficient number, since it is larger than the sum of its proper divisors (284781).

22491379 is an equidigital number, since it uses as much as digits as its factorization.

22491379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284780.

The product of its digits is 27216, while the sum is 37.

The square root of 22491379 is about 4742.5076699991. The cubic root of 22491379 is about 282.2747477400.

It can be divided in two parts, 22 and 491379, that added together give a square (491401 = 701²).

The spelling of 22491379 in words is "twenty-two million, four hundred ninety-one thousand, three hundred seventy-nine".