18733969 has 2 divisors, whose sum is σ = 18733970. Its totient is φ = 18733968.

The previous prime is 18733933. The next prime is 18733973. The reversal of 18733969 is 96933781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 140625 = 4312^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 18733969 - 2⁹ = 18733457 is a prime.

It is a super-2 number, since 2×18733969² = 701923188985922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18733999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9366984 + 9366985.

It is an arithmetic number, because the mean of its divisors is an integer number (9366985).

Almost surely, 2^18733969 is an apocalyptic number.

It is an amenable number.

18733969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18733969 is an equidigital number, since it uses as much as digits as its factorization.

18733969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 18733969 is about 4328.2755226533. The cubic root of 18733969 is about 265.5889074651.

The spelling of 18733969 in words is "eighteen million, seven hundred thirty-three thousand, nine hundred sixty-nine".