18190605 has 16 divisors (see below), whose sum is σ = 29395584. Its totient is φ = 9604800.

The previous prime is 18190603. The next prime is 18190633. The reversal of 18190605 is 50609181.

It is a happy number.

It is not a de Polignac number, because 18190605 - 2¹ = 18190603 is a prime.

It is a super-2 number, since 2×18190605² = 661796220532050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18190603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4489 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (1837224).

Almost surely, 2^18190605 is an apocalyptic number.

18190605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18190605 is a deficient number, since it is larger than the sum of its proper divisors (11204979).

18190605 is a wasteful number, since it uses less digits than its factorization.

18190605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12116.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 18190605 is about 4265.0445484192. The cubic root of 18190605 is about 262.9959422430.

Adding to 18190605 its reverse (50609181), we get a palindrome (68799786).

It can be divided in two parts, 18 and 190605, that multiplied together give a triangular number (3430890 = T₂₆₁₉).

The spelling of 18190605 in words is "eighteen million, one hundred ninety thousand, six hundred five".