18700453 has 4 divisors (see below), whose sum is σ = 18885708. Its totient is φ = 18515200.

The previous prime is 18700439. The next prime is 18700457. The reversal of 18700453 is 35400781.

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 11950849 + 6749604 = 3457^2 + 2598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18700453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18700457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92476 + ... + 92677.

It is an arithmetic number, because the mean of its divisors is an integer number (4721427).

Almost surely, 2^18700453 is an apocalyptic number.

It is an amenable number.

18700453 is a deficient number, since it is larger than the sum of its proper divisors (185255).

18700453 is a wasteful number, since it uses less digits than its factorization.

18700453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185254.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 18700453 is about 4324.4020395888. The cubic root of 18700453 is about 265.4304290082.

The spelling of 18700453 in words is "eighteen million, seven hundred thousand, four hundred fifty-three".