18406169 has 2 divisors, whose sum is σ = 18406170. Its totient is φ = 18406168.

The previous prime is 18406153. The next prime is 18406181. The reversal of 18406169 is 96160481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 44944 = 4285^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 18406169 - 2⁴ = 18406153 is a prime.

It is a super-2 number, since 2×18406169² = 677574114513122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18406109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9203084 + 9203085.

It is an arithmetic number, because the mean of its divisors is an integer number (9203085).

Almost surely, 2^18406169 is an apocalyptic number.

It is an amenable number.

18406169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18406169 is an equidigital number, since it uses as much as digits as its factorization.

18406169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18406169 is about 4290.2411354142. The cubic root of 18406169 is about 264.0307251124.

The spelling of 18406169 in words is "eighteen million, four hundred six thousand, one hundred sixty-nine".