18457864 has 8 divisors (see below), whose sum is σ = 34608510. Its totient is φ = 9228928.

The previous prime is 18457861. The next prime is 18457871. The reversal of 18457864 is 46875481.

It can be written as a sum of positive squares in only one way, i.e., 16080100 + 2377764 = 4010^2 + 1542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18457864.

It is not an unprimeable number, because it can be changed into a prime (18457861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1153609 + ... + 1153624.

Almost surely, 2^18457864 is an apocalyptic number.

It is an amenable number.

18457864 is a deficient number, since it is larger than the sum of its proper divisors (16150646).

18457864 is a wasteful number, since it uses less digits than its factorization.

18457864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307239 (or 2307235 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 18457864 is about 4296.2616307669. The cubic root of 18457864 is about 264.2776769200.

It can be divided in two parts, 18457 and 864, that added together give a square (19321 = 139²).

The spelling of 18457864 in words is "eighteen million, four hundred fifty-seven thousand, eight hundred sixty-four".