22819987 has 2 divisors, whose sum is σ = 22819988. Its totient is φ = 22819986.

The previous prime is 22819981. The next prime is 22819991. The reversal of 22819987 is 78991822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22819987 - 2¹⁹ = 22295699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22819981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11409993 + 11409994.

It is an arithmetic number, because the mean of its divisors is an integer number (11409994).

Almost surely, 2^22819987 is an apocalyptic number.

22819987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22819987 is an equidigital number, since it uses as much as digits as its factorization.

22819987 is an evil number, because the sum of its binary digits is even.

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

The square root of 22819987 is about 4777.0270043197. The cubic root of 22819987 is about 283.6428219876.

The spelling of 22819987 in words is "twenty-two million, eight hundred nineteen thousand, nine hundred eighty-seven".