18151964 has 12 divisors (see below), whose sum is σ = 32442144. Its totient is φ = 8882784.

The previous prime is 18151949. The next prime is 18151967. The reversal of 18151964 is 46915181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18151967) 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, 48089 + ... + 48464.

It is an arithmetic number, because the mean of its divisors is an integer number (2703512).

Almost surely, 2^18151964 is an apocalyptic number.

It is an amenable number.

18151964 is a deficient number, since it is larger than the sum of its proper divisors (14290180).

18151964 is a wasteful number, since it uses less digits than its factorization.

18151964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96604 (or 96602 counting only the distinct ones).

The product of its digits is 8640, while the sum is 35.

The square root of 18151964 is about 4260.5121757836. The cubic root of 18151964 is about 262.8095890773.

The spelling of 18151964 in words is "eighteen million, one hundred fifty-one thousand, nine hundred sixty-four".