18234493 has 2 divisors, whose sum is σ = 18234494. Its totient is φ = 18234492.

The previous prime is 18234473. The next prime is 18234497. The reversal of 18234493 is 39443281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 4418404 = 3717^2 + 2102^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18234493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18234497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9117246 + 9117247.

It is an arithmetic number, because the mean of its divisors is an integer number (9117247).

Almost surely, 2^18234493 is an apocalyptic number.

It is an amenable number.

18234493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18234493 is an equidigital number, since it uses as much as digits as its factorization.

18234493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 18234493 is about 4270.1865298837. The cubic root of 18234493 is about 263.2072801961.

It can be divided in two parts, 182 and 34493, that multiplied together give a palindrome (6277726).

The spelling of 18234493 in words is "eighteen million, two hundred thirty-four thousand, four hundred ninety-three".