18648994 has 32 divisors (see below), whose sum is σ = 36247680. Its totient is φ = 6988032.

The previous prime is 18648991. The next prime is 18648997. The reversal of 18648994 is 49984681.

It is an interprime number because it is at equal distance from previous prime (18648991) and next prime (18648997).

It is not an unprimeable number, because it can be changed into a prime (18648991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762 + ... + 6154.

It is an arithmetic number, because the mean of its divisors is an integer number (1132740).

Almost surely, 2^18648994 is an apocalyptic number.

18648994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18648994 is a deficient number, since it is larger than the sum of its proper divisors (17598686).

18648994 is a wasteful number, since it uses less digits than its factorization.

18648994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5434.

The product of its digits is 497664, while the sum is 49.

The square root of 18648994 is about 4318.4481008807. The cubic root of 18648994 is about 265.1867391510.

The spelling of 18648994 in words is "eighteen million, six hundred forty-eight thousand, nine hundred ninety-four".