18400453 has 16 divisors (see below), whose sum is σ = 19777536. Its totient is φ = 17089920.

The previous prime is 18400451. The next prime is 18400489. The reversal of 18400453 is 35400481.

It is a cyclic number.

It is not a de Polignac number, because 18400453 - 2¹ = 18400451 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 (18400451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106275 + ... + 106447.

It is an arithmetic number, because the mean of its divisors is an integer number (1236096).

Almost surely, 2^18400453 is an apocalyptic number.

It is an amenable number.

18400453 is a deficient number, since it is larger than the sum of its proper divisors (1377083).

18400453 is a wasteful number, since it uses less digits than its factorization.

18400453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 18400453 is about 4289.5749206652. The cubic root of 18400453 is about 264.0033908732.

The spelling of 18400453 in words is "eighteen million, four hundred thousand, four hundred fifty-three".