22978489 has 4 divisors (see below), whose sum is σ = 23009140. Its totient is φ = 22947840.

The previous prime is 22978481. The next prime is 22978499. The reversal of 22978489 is 98487922.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5405625 + 17572864 = 2325^2 + 4192^2 .

It is a cyclic number.

It is not a de Polignac number, because 22978489 - 2³ = 22978481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22978481) 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 3 ways as a sum of consecutive naturals, for example, 14172 + ... + 15709.

It is an arithmetic number, because the mean of its divisors is an integer number (5752285).

Almost surely, 2^22978489 is an apocalyptic number.

It is an amenable number.

22978489 is a deficient number, since it is larger than the sum of its proper divisors (30651).

22978489 is an equidigital number, since it uses as much as digits as its factorization.

22978489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30650.

The product of its digits is 580608, while the sum is 49.

The square root of 22978489 is about 4793.5883219150. The cubic root of 22978489 is about 284.2980117477.

The spelling of 22978489 in words is "twenty-two million, nine hundred seventy-eight thousand, four hundred eighty-nine".