18156453 has 16 divisors (see below), whose sum is σ = 28870656. Its totient is φ = 9923760.

The previous prime is 18156433. The next prime is 18156461. The reversal of 18156453 is 35465181.

It is not a de Polignac number, because 18156453 - 2⁸ = 18156197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18156433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18313 + ... + 19278.

It is an arithmetic number, because the mean of its divisors is an integer number (1804416).

Almost surely, 2^18156453 is an apocalyptic number.

It is an amenable number.

18156453 is a deficient number, since it is larger than the sum of its proper divisors (10714203).

18156453 is a wasteful number, since it uses less digits than its factorization.

18156453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37624.

The product of its digits is 14400, while the sum is 33.

The square root of 18156453 is about 4261.0389578130. The cubic root of 18156453 is about 262.8312516553.

The spelling of 18156453 in words is "eighteen million, one hundred fifty-six thousand, four hundred fifty-three".