22117887 has 16 divisors (see below), whose sum is σ = 35746560. Its totient is φ = 13404600.

The previous prime is 22117883. The next prime is 22117891. The reversal of 22117887 is 78871122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22117883) and next prime (22117891).

It is not a de Polignac number, because 22117887 - 2² = 22117883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22117883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36939 + ... + 37532.

It is an arithmetic number, because the mean of its divisors is an integer number (2234160).

Almost surely, 2^22117887 is an apocalyptic number.

22117887 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

22117887 is a deficient number, since it is larger than the sum of its proper divisors (13628673).

22117887 is a wasteful number, since it uses less digits than its factorization.

22117887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74491 (or 74485 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 22117887 is about 4702.9657664074. The cubic root of 22117887 is about 280.7035326822.

The spelling of 22117887 in words is "twenty-two million, one hundred seventeen thousand, eight hundred eighty-seven".