18217969 has 16 divisors (see below), whose sum is σ = 22847616. Its totient is φ = 14112000.

The previous prime is 18217957. The next prime is 18217993. The reversal of 18217969 is 96971281.

It is not a de Polignac number, because 18217969 - 2⁵ = 18217937 is a prime.

It is a super-2 number, since 2×18217969² = 663788788969922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18217669) 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, 14569 + ... + 15769.

It is an arithmetic number, because the mean of its divisors is an integer number (1427976).

Almost surely, 2^18217969 is an apocalyptic number.

It is an amenable number.

18217969 is a deficient number, since it is larger than the sum of its proper divisors (4629647).

18217969 is a wasteful number, since it uses less digits than its factorization.

18217969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416.

The product of its digits is 54432, while the sum is 43.

The square root of 18217969 is about 4268.2512812626. The cubic root of 18217969 is about 263.1277504917.

The spelling of 18217969 in words is "eighteen million, two hundred seventeen thousand, nine hundred sixty-nine".