18451868 has 12 divisors (see below), whose sum is σ = 34190352. Its totient is φ = 8683200.

The previous prime is 18451861. The next prime is 18451879. The reversal of 18451868 is 86815481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18451861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135608 + ... + 135743.

It is an arithmetic number, because the mean of its divisors is an integer number (2849196).

Almost surely, 2^18451868 is an apocalyptic number.

It is an amenable number.

18451868 is a deficient number, since it is larger than the sum of its proper divisors (15738484).

18451868 is a wasteful number, since it uses less digits than its factorization.

18451868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271372 (or 271370 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The square root of 18451868 is about 4295.5637581114. The cubic root of 18451868 is about 264.2490571301.

The spelling of 18451868 in words is "eighteen million, four hundred fifty-one thousand, eight hundred sixty-eight".