18040451 has 32 divisors (see below), whose sum is σ = 23115456. Its totient is φ = 13824000.

The previous prime is 18040447. The next prime is 18040457. The reversal of 18040451 is 15404081.

It is a cyclic number.

It is not a de Polignac number, because 18040451 - 2² = 18040447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18040457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99581 + ... + 99761.

It is an arithmetic number, because the mean of its divisors is an integer number (722358).

Almost surely, 2^18040451 is an apocalyptic number.

18040451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18040451 is a deficient number, since it is larger than the sum of its proper divisors (5075005).

18040451 is a wasteful number, since it uses less digits than its factorization.

18040451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18040451 is about 4247.4052078887. The cubic root of 18040451 is about 262.2703103406.

The spelling of 18040451 in words is "eighteen million, forty thousand, four hundred fifty-one".