22507997 has 4 divisors (see below), whose sum is σ = 22633920. Its totient is φ = 22382076.

The previous prime is 22507981. The next prime is 22508009. The reversal of 22507997 is 79970522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22507997 - 2⁴ = 22507981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22507907) 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, 62693 + ... + 63050.

It is an arithmetic number, because the mean of its divisors is an integer number (5658480).

Almost surely, 2^22507997 is an apocalyptic number.

It is an amenable number.

22507997 is a deficient number, since it is larger than the sum of its proper divisors (125923).

22507997 is a wasteful number, since it uses less digits than its factorization.

22507997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125922.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 22507997 is about 4744.2593731793. The cubic root of 22507997 is about 282.3442512142.

The spelling of 22507997 in words is "twenty-two million, five hundred seven thousand, nine hundred ninety-seven".