18813469 has 2 divisors, whose sum is σ = 18813470. Its totient is φ = 18813468.

The previous prime is 18813451. The next prime is 18813479. The reversal of 18813469 is 96431881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12687844 + 6125625 = 3562^2 + 2475^2 .

It is a cyclic number.

It is not a de Polignac number, because 18813469 - 2¹⁷ = 18682397 is a prime.

It is a super-2 number, since 2×18813469² = 707893231627922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18813419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406734 + 9406735.

It is an arithmetic number, because the mean of its divisors is an integer number (9406735).

Almost surely, 2^18813469 is an apocalyptic number.

It is an amenable number.

18813469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18813469 is an equidigital number, since it uses as much as digits as its factorization.

18813469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 18813469 is about 4337.4495962489. The cubic root of 18813469 is about 265.9640641525.

The spelling of 18813469 in words is "eighteen million, eight hundred thirteen thousand, four hundred sixty-nine".