18051969 has 8 divisors (see below), whose sum is σ = 25920832. Its totient is φ = 11108880.

The previous prime is 18051953. The next prime is 18051973. The reversal of 18051969 is 96915081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18051969 - 2⁴ = 18051953 is a prime.

It is a super-2 number, since 2×18051969² = 651747169553922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 462871 = 18051969 / (1 + 8 + 0 + 5 + 1 + 9 + 6 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18051989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231397 + ... + 231474.

It is an arithmetic number, because the mean of its divisors is an integer number (3240104).

Almost surely, 2^18051969 is an apocalyptic number.

It is an amenable number.

18051969 is a deficient number, since it is larger than the sum of its proper divisors (7868863).

18051969 is a wasteful number, since it uses less digits than its factorization.

18051969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462887.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 18051969 is about 4248.7608781855. The cubic root of 18051969 is about 262.3261143183.

The spelling of 18051969 in words is "eighteen million, fifty-one thousand, nine hundred sixty-nine".