18701965 has 4 divisors (see below), whose sum is σ = 22442364. Its totient is φ = 14961568.

The previous prime is 18701941. The next prime is 18701971. The reversal of 18701965 is 56910781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3437316 + 15264649 = 1854^2 + 3907^2 .

It is a cyclic number.

It is not a de Polignac number, because 18701965 - 2⁵ = 18701933 is a prime.

It is a super-2 number, since 2×18701965² = 699526989722450, which contains 22 as substring.

It is a Duffinian number.

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, 1870192 + ... + 1870201.

It is an arithmetic number, because the mean of its divisors is an integer number (5610591).

Almost surely, 2^18701965 is an apocalyptic number.

It is an amenable number.

18701965 is a deficient number, since it is larger than the sum of its proper divisors (3740399).

18701965 is an equidigital number, since it uses as much as digits as its factorization.

18701965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740398.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 18701965 is about 4324.5768579134. The cubic root of 18701965 is about 265.4375824889.

The spelling of 18701965 in words is "eighteen million, seven hundred one thousand, nine hundred sixty-five".