18912969 has 12 divisors (see below), whose sum is σ = 28506816. Its totient is φ = 12060312.

The previous prime is 18912937. The next prime is 18912979. The reversal of 18912969 is 96921981.

It is not a de Polignac number, because 18912969 - 2⁵ = 18912937 is a prime.

It is a super-2 number, since 2×18912969² = 715400792789922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18912919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45477 + ... + 45890.

It is an arithmetic number, because the mean of its divisors is an integer number (2375568).

Almost surely, 2^18912969 is an apocalyptic number.

It is an amenable number.

18912969 is a deficient number, since it is larger than the sum of its proper divisors (9593847).

18912969 is a wasteful number, since it uses less digits than its factorization.

18912969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91396 (or 91393 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 18912969 is about 4348.9043447747. The cubic root of 18912969 is about 266.4321137192.

It can be divided in two parts, 18912 and 969, that added together give a square (19881 = 141²).

The spelling of 18912969 in words is "eighteen million, nine hundred twelve thousand, nine hundred sixty-nine".