18500465 has 4 divisors (see below), whose sum is σ = 22200564. Its totient is φ = 14800368.

The previous prime is 18500431. The next prime is 18500477. The reversal of 18500465 is 56400581.

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: 56400581 = 191 ⋅295291.

It can be written as a sum of positive squares in 2 ways, for example, as 2211169 + 16289296 = 1487^2 + 4036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18500465 is a prime.

It is a Duffinian 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, 1850042 + ... + 1850051.

It is an arithmetic number, because the mean of its divisors is an integer number (5550141).

Almost surely, 2^18500465 is an apocalyptic number.

It is an amenable number.

18500465 is a deficient number, since it is larger than the sum of its proper divisors (3700099).

18500465 is an equidigital number, since it uses as much as digits as its factorization.

18500465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700098.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 18500465 is about 4301.2166883337. The cubic root of 18500465 is about 264.4808395181.

The spelling of 18500465 in words is "eighteen million, five hundred thousand, four hundred sixty-five".