22940978 has 4 divisors (see below), whose sum is σ = 34411470. Its totient is φ = 11470488.

The previous prime is 22940971. The next prime is 22940987. The reversal of 22940978 is 87904922.

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

It can be written as a sum of positive squares in only one way, i.e., 20729809 + 2211169 = 4553^2 + 1487^2 .

It is not an unprimeable number, because it can be changed into a prime (22940971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5735243 + ... + 5735246.

Almost surely, 2^22940978 is an apocalyptic number.

22940978 is a deficient number, since it is larger than the sum of its proper divisors (11470492).

22940978 is a wasteful number, since it uses less digits than its factorization.

22940978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11470491.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 22940978 is about 4789.6741016483. The cubic root of 22940978 is about 284.1432276953.

The spelling of 22940978 in words is "twenty-two million, nine hundred forty thousand, nine hundred seventy-eight".