18880257 has 16 divisors (see below), whose sum is σ = 27724032. Its totient is φ = 11333520.

The previous prime is 18880241. The next prime is 18880297. The reversal of 18880257 is 75208881.

It is not a de Polignac number, because 18880257 - 2⁴ = 18880241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18880207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858 + ... + 6204.

It is an arithmetic number, because the mean of its divisors is an integer number (1732752).

Almost surely, 2^18880257 is an apocalyptic number.

It is an amenable number.

18880257 is a deficient number, since it is larger than the sum of its proper divisors (8843775).

18880257 is a wasteful number, since it uses less digits than its factorization.

18880257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 18880257 is about 4345.1417698390. The cubic root of 18880257 is about 266.2784174742.

The spelling of 18880257 in words is "eighteen million, eight hundred eighty thousand, two hundred fifty-seven".