22402991 has 24 divisors (see below), whose sum is σ = 26303760. Its totient is φ = 18957312.

The previous prime is 22402979. The next prime is 22402999. The reversal of 22402991 is 19920422.

It is not a de Polignac number, because 22402991 - 2¹⁴ = 22386607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22402999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251675 + ... + 251763.

It is an arithmetic number, because the mean of its divisors is an integer number (1095990).

Almost surely, 2^22402991 is an apocalyptic number.

22402991 is a deficient number, since it is larger than the sum of its proper divisors (3900769).

22402991 is a wasteful number, since it uses less digits than its factorization.

22402991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 22402991 is about 4733.1797979794. The cubic root of 22402991 is about 281.9044954328.

The spelling of 22402991 in words is "twenty-two million, four hundred two thousand, nine hundred ninety-one".