18373987 has 8 divisors (see below), whose sum is σ = 19535904. Its totient is φ = 17242368.

The previous prime is 18373981. The next prime is 18374011. The reversal of 18373987 is 78937381.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18373987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18373981) 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, 6318 + ... + 8755.

It is an arithmetic number, because the mean of its divisors is an integer number (2441988).

Almost surely, 2^18373987 is an apocalyptic number.

18373987 is a deficient number, since it is larger than the sum of its proper divisors (1161917).

18373987 is a wasteful number, since it uses less digits than its factorization.

18373987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15149.

The product of its digits is 254016, while the sum is 46.

The square root of 18373987 is about 4286.4888895225. The cubic root of 18373987 is about 263.8767551076.

The spelling of 18373987 in words is "eighteen million, three hundred seventy-three thousand, nine hundred eighty-seven".