18919485 has 24 divisors (see below), whose sum is σ = 35317464. Its totient is φ = 9313920.

The previous prime is 18919451. The next prime is 18919493. The reversal of 18919485 is 58491981.

It can be written as a sum of positive squares in 4 ways, for example, as 205209 + 18714276 = 453^2 + 4326^2 .

It is not a de Polignac number, because 18919485 - 2⁹ = 18918973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18919485.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15586 + ... + 16755.

It is an arithmetic number, because the mean of its divisors is an integer number (1471561).

Almost surely, 2^18919485 is an apocalyptic number.

18919485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18919485 is a deficient number, since it is larger than the sum of its proper divisors (16397979).

18919485 is a wasteful number, since it uses less digits than its factorization.

18919485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32365 (or 32362 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 18919485 is about 4349.6534344704. The cubic root of 18919485 is about 266.4627077579.

The spelling of 18919485 in words is "eighteen million, nine hundred nineteen thousand, four hundred eighty-five".