18950665 has 16 divisors (see below), whose sum is σ = 24303888. Its totient is φ = 14135296.

The previous prime is 18950653. The next prime is 18950669. The reversal of 18950665 is 56605981.

It can be written as a sum of positive squares in 8 ways, for example, as 2886601 + 16064064 = 1699^2 + 4008^2 .

It is not a de Polignac number, because 18950665 - 2⁷ = 18950537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18950669) 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, 8619 + ... + 10591.

It is an arithmetic number, because the mean of its divisors is an integer number (1518993).

Almost surely, 2^18950665 is an apocalyptic number.

It is an amenable number.

18950665 is a deficient number, since it is larger than the sum of its proper divisors (5353223).

18950665 is a wasteful number, since it uses less digits than its factorization.

18950665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 18950665 is about 4353.2361525651. The cubic root of 18950665 is about 266.6090074990.

The spelling of 18950665 in words is "eighteen million, nine hundred fifty thousand, six hundred sixty-five".