22978819 has 4 divisors (see below), whose sum is σ = 23539320. Its totient is φ = 22418320.

The previous prime is 22978811. The next prime is 22978829. The reversal of 22978819 is 91887922.

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

It is a cyclic number.

It is not a de Polignac number, because 22978819 - 2³ = 22978811 is a prime.

It is a super-2 number, since 2×22978819² = 1056052245269522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22978811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280189 + ... + 280270.

It is an arithmetic number, because the mean of its divisors is an integer number (5884830).

Almost surely, 2^22978819 is an apocalyptic number.

22978819 is a deficient number, since it is larger than the sum of its proper divisors (560501).

22978819 is an equidigital number, since it uses as much as digits as its factorization.

22978819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560500.

The product of its digits is 145152, while the sum is 46.

The square root of 22978819 is about 4793.6227427698. The cubic root of 22978819 is about 284.2993727001.

The spelling of 22978819 in words is "twenty-two million, nine hundred seventy-eight thousand, eight hundred nineteen".