18394469 has 2 divisors, whose sum is σ = 18394470. Its totient is φ = 18394468.

The previous prime is 18394463. The next prime is 18394499. The reversal of 18394469 is 96449381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 289444 = 4255^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 18394469 - 2⁸ = 18394213 is a prime.

It is a super-2 number, since 2×18394469² = 676712979583922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18394463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9197234 + 9197235.

It is an arithmetic number, because the mean of its divisors is an integer number (9197235).

Almost surely, 2^18394469 is an apocalyptic number.

It is an amenable number.

18394469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18394469 is an equidigital number, since it uses as much as digits as its factorization.

18394469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 18394469 is about 4288.8773589367. The cubic root of 18394469 is about 263.9747689768.

The spelling of 18394469 in words is "eighteen million, three hundred ninety-four thousand, four hundred sixty-nine".