18033457 has 4 divisors (see below), whose sum is σ = 19420660. Its totient is φ = 16646256.

The previous prime is 18033439. The next prime is 18033461. The reversal of 18033457 is 75433081.

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 9265936 + 8767521 = 3044^2 + 2961^2 .

It is a cyclic number.

It is not a de Polignac number, because 18033457 - 2¹⁹ = 17509169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18033427) 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 3 ways as a sum of consecutive naturals, for example, 693582 + ... + 693607.

It is an arithmetic number, because the mean of its divisors is an integer number (4855165).

Almost surely, 2^18033457 is an apocalyptic number.

It is an amenable number.

18033457 is a deficient number, since it is larger than the sum of its proper divisors (1387203).

18033457 is a wasteful number, since it uses less digits than its factorization.

18033457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387202.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 18033457 is about 4246.5818018731. The cubic root of 18033457 is about 262.2364132640.

The spelling of 18033457 in words is "eighteen million, thirty-three thousand, four hundred fifty-seven".