18321769 has 2 divisors, whose sum is σ = 18321770. Its totient is φ = 18321768.

The previous prime is 18321761. The next prime is 18321817. The reversal of 18321769 is 96712381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14160169 + 4161600 = 3763^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 18321769 - 2³ = 18321761 is a prime.

It is a super-2 number, since 2×18321769² = 671374438578722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18321761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9160884 + 9160885.

It is an arithmetic number, because the mean of its divisors is an integer number (9160885).

Almost surely, 2^18321769 is an apocalyptic number.

It is an amenable number.

18321769 is a deficient number, since it is larger than the sum of its proper divisors (1).

18321769 is an equidigital number, since it uses as much as digits as its factorization.

18321769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 18321769 is about 4280.3935566721. The cubic root of 18321769 is about 263.6265428511.

It can be divided in two parts, 183 and 21769, that added together give a cube (21952 = 28³).

The spelling of 18321769 in words is "eighteen million, three hundred twenty-one thousand, seven hundred sixty-nine".