22170987 has 6 divisors (see below), whose sum is σ = 32024772. Its totient is φ = 14780652.

The previous prime is 22170979. The next prime is 22170989. The reversal of 22170987 is 78907122.

It is not a de Polignac number, because 22170987 - 2³ = 22170979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22170989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1231713 + ... + 1231730.

It is an arithmetic number, because the mean of its divisors is an integer number (5337462).

Almost surely, 2^22170987 is an apocalyptic number.

22170987 is a deficient number, since it is larger than the sum of its proper divisors (9853785).

22170987 is a wasteful number, since it uses less digits than its factorization.

22170987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2463449 (or 2463446 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 22170987 is about 4708.6077560145. The cubic root of 22170987 is about 280.9279882002.

The spelling of 22170987 in words is "twenty-two million, one hundred seventy thousand, nine hundred eighty-seven".