18234397 has 4 divisors (see below), whose sum is σ = 18307296. Its totient is φ = 18161500.

The previous prime is 18234383. The next prime is 18234427. The reversal of 18234397 is 79343281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18234397 - 2¹¹ = 18232349 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 (18234497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36073 + ... + 36574.

It is an arithmetic number, because the mean of its divisors is an integer number (4576824).

Almost surely, 2^18234397 is an apocalyptic number.

It is an amenable number.

18234397 is a deficient number, since it is larger than the sum of its proper divisors (72899).

18234397 is an equidigital number, since it uses as much as digits as its factorization.

18234397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72898.

The product of its digits is 36288, while the sum is 37.

The square root of 18234397 is about 4270.1752891421. The cubic root of 18234397 is about 263.2068182886.

The spelling of 18234397 in words is "eighteen million, two hundred thirty-four thousand, three hundred ninety-seven".