22699987 has 2 divisors, whose sum is σ = 22699988. Its totient is φ = 22699986.

The previous prime is 22699973. The next prime is 22699993. The reversal of 22699987 is 78999622.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22699987 is a prime.

It is not a weakly prime, because it can be changed into another prime (22699997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11349993 + 11349994.

It is an arithmetic number, because the mean of its divisors is an integer number (11349994).

Almost surely, 2^22699987 is an apocalyptic number.

22699987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22699987 is an equidigital number, since it uses as much as digits as its factorization.

22699987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 22699987 is about 4764.4503355581. The cubic root of 22699987 is about 283.1447648017.

The spelling of 22699987 in words is "twenty-two million, six hundred ninety-nine thousand, nine hundred eighty-seven".