18839397 has 8 divisors (see below), whose sum is σ = 25178944. Its totient is φ = 12529728.

The previous prime is 18839389. The next prime is 18839399. The reversal of 18839397 is 79393881.

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

It is not a de Polignac number, because 18839397 - 2³ = 18839389 is a prime.

It is a super-4 number, since 4×18839397⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18839399) 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, 5953 + ... + 8550.

It is an arithmetic number, because the mean of its divisors is an integer number (3147368).

Almost surely, 2^18839397 is an apocalyptic number.

It is an amenable number.

18839397 is a deficient number, since it is larger than the sum of its proper divisors (6339547).

18839397 is a wasteful number, since it uses less digits than its factorization.

18839397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14939.

The product of its digits is 326592, while the sum is 48.

The square root of 18839397 is about 4340.4374203529. The cubic root of 18839397 is about 266.0861885515.

The spelling of 18839397 in words is "eighteen million, eight hundred thirty-nine thousand, three hundred ninety-seven".