18770985 has 12 divisors (see below), whose sum is σ = 32536452. Its totient is φ = 10011168.

The previous prime is 18770971. The next prime is 18771007. The reversal of 18770985 is 58907781.

It can be written as a sum of positive squares in 2 ways, for example, as 6471936 + 12299049 = 2544^2 + 3507^2 .

It is not a de Polignac number, because 18770985 - 2¹⁵ = 18738217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 417133 = 18770985 / (1 + 8 + 7 + 7 + 0 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 18770985.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208522 + ... + 208611.

It is an arithmetic number, because the mean of its divisors is an integer number (2711371).

Almost surely, 2^18770985 is an apocalyptic number.

18770985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18770985 is a deficient number, since it is larger than the sum of its proper divisors (13765467).

18770985 is a wasteful number, since it uses less digits than its factorization.

18770985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417144 (or 417141 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 18770985 is about 4332.5494803868. The cubic root of 18770985 is about 265.7637159663.

The spelling of 18770985 in words is "eighteen million, seven hundred seventy thousand, nine hundred eighty-five".