22746991 has 4 divisors (see below), whose sum is σ = 23531400. Its totient is φ = 21962584.

The previous prime is 22746973. The next prime is 22747001. The reversal of 22746991 is 19964722.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22746991 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 (22744991) 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, 392161 + ... + 392218.

It is an arithmetic number, because the mean of its divisors is an integer number (5882850).

Almost surely, 2^22746991 is an apocalyptic number.

22746991 is a deficient number, since it is larger than the sum of its proper divisors (784409).

22746991 is an equidigital number, since it uses as much as digits as its factorization.

22746991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784408.

The product of its digits is 54432, while the sum is 40.

The square root of 22746991 is about 4769.3805677467. The cubic root of 22746991 is about 283.3400624315.

The spelling of 22746991 in words is "twenty-two million, seven hundred forty-six thousand, nine hundred ninety-one".