18974745 has 12 divisors (see below), whose sum is σ = 32889636. Its totient is φ = 10119840.

The previous prime is 18974743. The next prime is 18974779. The reversal of 18974745 is 54747981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6843456 + 12131289 = 2616^2 + 3483^2 .

It is not a de Polignac number, because 18974745 - 2¹ = 18974743 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: 421661 = 18974745 / (1 + 8 + 9 + 7 + 4 + 7 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 18974745.

It is not an unprimeable number, because it can be changed into a prime (18974741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210786 + ... + 210875.

It is an arithmetic number, because the mean of its divisors is an integer number (2740803).

Almost surely, 2^18974745 is an apocalyptic number.

18974745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18974745 is a deficient number, since it is larger than the sum of its proper divisors (13914891).

18974745 is a wasteful number, since it uses less digits than its factorization.

18974745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421672 (or 421669 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 18974745 is about 4356.0010330577. The cubic root of 18974745 is about 266.7218835311.

The spelling of 18974745 in words is "eighteen million, nine hundred seventy-four thousand, seven hundred forty-five".