18994940 has 24 divisors (see below), whose sum is σ = 41177472. Its totient is φ = 7352640.

The previous prime is 18994907. The next prime is 18994979. The reversal of 18994940 is 4949981.

It is a junction number, because it is equal to n+sod(n) for n = 18994891 and 18994900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14699 + ... + 15938.

It is an arithmetic number, because the mean of its divisors is an integer number (1715728).

Almost surely, 2^18994940 is an apocalyptic number.

18994940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18994940 is an abundant number, since it is smaller than the sum of its proper divisors (22182532).

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

18994940 is a wasteful number, since it uses less digits than its factorization.

18994940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30677 (or 30675 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18994940 is about 4358.3184830850. The cubic root of 18994940 is about 266.8164748527.

The spelling of 18994940 in words is "eighteen million, nine hundred ninety-four thousand, nine hundred forty".