18912069 has 32 divisors (see below), whose sum is σ = 31409280. Its totient is φ = 11145600.

The previous prime is 18912059. The next prime is 18912071. The reversal of 18912069 is 96021981.

It is not a de Polignac number, because 18912069 - 2⁴ = 18912053 is a prime.

It is a super-2 number, since 2×18912069² = 715332707721522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18912059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10129 + ... + 11849.

It is an arithmetic number, because the mean of its divisors is an integer number (981540).

Almost surely, 2^18912069 is an apocalyptic number.

It is an amenable number.

18912069 is a deficient number, since it is larger than the sum of its proper divisors (12497211).

18912069 is a wasteful number, since it uses less digits than its factorization.

18912069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778 (or 1772 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 18912069 is about 4348.8008692052. The cubic root of 18912069 is about 266.4278874710.

The spelling of 18912069 in words is "eighteen million, nine hundred twelve thousand, sixty-nine".