18994937 has 8 divisors (see below), whose sum is σ = 20562696. Its totient is φ = 17442432.

The previous prime is 18994907. The next prime is 18994979. The reversal of 18994937 is 73949981.

It can be written as a sum of positive squares in 4 ways, for example, as 7678441 + 11316496 = 2771^2 + 3364^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18994937 - 2¹² = 18990841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18994907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148 + ... + 6269.

It is an arithmetic number, because the mean of its divisors is an integer number (2570337).

Almost surely, 2^18994937 is an apocalyptic number.

It is an amenable number.

18994937 is a deficient number, since it is larger than the sum of its proper divisors (1567759).

18994937 is a wasteful number, since it uses less digits than its factorization.

18994937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627.

The product of its digits is 489888, while the sum is 50.

The square root of 18994937 is about 4358.3181389155. The cubic root of 18994937 is about 266.8164608060.

The spelling of 18994937 in words is "eighteen million, nine hundred ninety-four thousand, nine hundred thirty-seven".