22398732 has 18 divisors (see below), whose sum is σ = 56619108. Its totient is φ = 7466232.

The previous prime is 22398731. The next prime is 22398749. The reversal of 22398732 is 23789322.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 622187 = 22398732 / (2 + 2 + 3 + 9 + 8 + 7 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (22398731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 311058 + ... + 311129.

It is an arithmetic number, because the mean of its divisors is an integer number (3145506).

Almost surely, 2^22398732 is an apocalyptic number.

It is an amenable number.

22398732 is an abundant number, since it is smaller than the sum of its proper divisors (34220376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22398732 is a wasteful number, since it uses less digits than its factorization.

22398732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622197 (or 622192 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 22398732 is about 4732.7298676345. The cubic root of 22398732 is about 281.8866301496.

The spelling of 22398732 in words is "twenty-two million, three hundred ninety-eight thousand, seven hundred thirty-two".