18158453 has 4 divisors (see below), whose sum is σ = 18649260. Its totient is φ = 17667648.

The previous prime is 18158447. The next prime is 18158473. The reversal of 18158453 is 35485181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35485181 = 2029 ⋅17489.

It can be written as a sum of positive squares in 2 ways, for example, as 16662724 + 1495729 = 4082^2 + 1223^2 .

It is not a de Polignac number, because 18158453 - 2⁸ = 18158197 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 (18158423) 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, 245348 + ... + 245421.

It is an arithmetic number, because the mean of its divisors is an integer number (4662315).

Almost surely, 2^18158453 is an apocalyptic number.

It is an amenable number.

18158453 is a deficient number, since it is larger than the sum of its proper divisors (490807).

18158453 is an equidigital number, since it uses as much as digits as its factorization.

18158453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490806.

The product of its digits is 19200, while the sum is 35.

The square root of 18158453 is about 4261.2736358981. The cubic root of 18158453 is about 262.8409019103.

It can be divided in two parts, 1815845 and 3, that added together give a cube (1815848 = 122³).

The spelling of 18158453 in words is "eighteen million, one hundred fifty-eight thousand, four hundred fifty-three".