18903397 has 8 divisors (see below), whose sum is σ = 19660032. Its totient is φ = 18156000.

The previous prime is 18903377. The next prime is 18903407. The reversal of 18903397 is 79330981.

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 18903397 - 2¹¹ = 18901349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18903307) 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, 2022 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (2457504).

Almost surely, 2^18903397 is an apocalyptic number.

It is an amenable number.

18903397 is a deficient number, since it is larger than the sum of its proper divisors (756635).

18903397 is a wasteful number, since it uses less digits than its factorization.

18903397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4619.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 18903397 is about 4347.8036984206. The cubic root of 18903397 is about 266.3871583493.

The spelling of 18903397 in words is "eighteen million, nine hundred three thousand, three hundred ninety-seven".