18190045 has 4 divisors (see below), whose sum is σ = 21828060. Its totient is φ = 14552032.

The previous prime is 18190037. The next prime is 18190063. The reversal of 18190045 is 54009181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54009181 = 5237 ⋅10313.

It can be written as a sum of positive squares in 2 ways, for example, as 2013561 + 16176484 = 1419^2 + 4022^2 .

It is a cyclic number.

It is not a de Polignac number, because 18190045 - 2³ = 18190037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18189995 and 18190022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819000 + ... + 1819009.

It is an arithmetic number, because the mean of its divisors is an integer number (5457015).

Almost surely, 2^18190045 is an apocalyptic number.

It is an amenable number.

18190045 is a deficient number, since it is larger than the sum of its proper divisors (3638015).

18190045 is an equidigital number, since it uses as much as digits as its factorization.

18190045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638014.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18190045 is about 4264.9788979548. The cubic root of 18190045 is about 262.9932434278.

The spelling of 18190045 in words is "eighteen million, one hundred ninety thousand, forty-five".