22401997 has 4 divisors (see below), whose sum is σ = 22481440. Its totient is φ = 22322556.

The previous prime is 22401979. The next prime is 22402013. The reversal of 22401997 is 79910422.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79910422 = 2 ⋅39955211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22401997 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 (22401947) 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, 39297 + ... + 39862.

It is an arithmetic number, because the mean of its divisors is an integer number (5620360).

Almost surely, 2^22401997 is an apocalyptic number.

It is an amenable number.

22401997 is a deficient number, since it is larger than the sum of its proper divisors (79443).

22401997 is an equidigital number, since it uses as much as digits as its factorization.

22401997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79442.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 22401997 is about 4733.0747934086. The cubic root of 22401997 is about 281.9003260906.

The spelling of 22401997 in words is "twenty-two million, four hundred one thousand, nine hundred ninety-seven".