18419994 has 32 divisors (see below), whose sum is σ = 41120640. Its totient is φ = 6111936.

The previous prime is 18419981. The next prime is 18420007. The reversal of 18419994 is 49991481.

It is an interprime number because it is at equal distance from previous prime (18419981) and next prime (18420007).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13554 + ... + 14850.

It is an arithmetic number, because the mean of its divisors is an integer number (1285020).

Almost surely, 2^18419994 is an apocalyptic number.

18419994 is an abundant number, since it is smaller than the sum of its proper divisors (22700646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18419994 is a wasteful number, since it uses less digits than its factorization.

18419994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571 (or 1565 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18419994 is about 4291.8520477761. The cubic root of 18419994 is about 264.0968136659.

The spelling of 18419994 in words is "eighteen million, four hundred nineteen thousand, nine hundred ninety-four".