18291145 has 8 divisors (see below), whose sum is σ = 22032000. Its totient is φ = 14577840.

The previous prime is 18291113. The next prime is 18291151. The reversal of 18291145 is 54119281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18291145 - 2⁵ = 18291113 is a prime.

It is a super-2 number, since 2×18291145² = 669131970822050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5395 + ... + 8104.

It is an arithmetic number, because the mean of its divisors is an integer number (2754000).

Almost surely, 2^18291145 is an apocalyptic number.

It is an amenable number.

18291145 is a deficient number, since it is larger than the sum of its proper divisors (3740855).

18291145 is a wasteful number, since it uses less digits than its factorization.

18291145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13775.

The product of its digits is 2880, while the sum is 31.

The square root of 18291145 is about 4276.8148194655. The cubic root of 18291145 is about 263.4795810325.

The spelling of 18291145 in words is "eighteen million, two hundred ninety-one thousand, one hundred forty-five".