18970331 has 8 divisors (see below), whose sum is σ = 20278944. Its totient is φ = 17702080.

The previous prime is 18970319. The next prime is 18970361. The reversal of 18970331 is 13307981.

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 18970331 - 2¹⁸ = 18708187 is a prime.

It is a super-2 number, since 2×18970331² = 719746916499122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18970361) 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, 9116 + ... + 11001.

It is an arithmetic number, because the mean of its divisors is an integer number (2534868).

Almost surely, 2^18970331 is an apocalyptic number.

18970331 is a deficient number, since it is larger than the sum of its proper divisors (1308613).

18970331 is a wasteful number, since it uses less digits than its factorization.

18970331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20181.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 18970331 is about 4355.4943462252. The cubic root of 18970331 is about 266.7011998681.

The spelling of 18970331 in words is "eighteen million, nine hundred seventy thousand, three hundred thirty-one".