22423978 has 4 divisors (see below), whose sum is σ = 33635970. Its totient is φ = 11211988.

The previous prime is 22423967. The next prime is 22423979. The reversal of 22423978 is 87932422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87932422 = 2 ⋅43966211.

It can be written as a sum of positive squares in only one way, i.e., 22250089 + 173889 = 4717^2 + 417^2 .

It is not an unprimeable number, because it can be changed into a prime (22423979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605993 + ... + 5605996.

Almost surely, 2^22423978 is an apocalyptic number.

22423978 is a deficient number, since it is larger than the sum of its proper divisors (11211992).

22423978 is a wasteful number, since it uses less digits than its factorization.

22423978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11211991.

The product of its digits is 48384, while the sum is 37.

The square root of 22423978 is about 4735.3962875350. The cubic root of 22423978 is about 281.9924968243.

The spelling of 22423978 in words is "twenty-two million, four hundred twenty-three thousand, nine hundred seventy-eight".