18342493 has 4 divisors (see below), whose sum is σ = 19753468. Its totient is φ = 16931520.

The previous prime is 18342487. The next prime is 18342497. The reversal of 18342493 is 39424381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2125764 + 16216729 = 1458^2 + 4027^2 .

It is a cyclic number.

It is not a de Polignac number, because 18342493 - 2⁵ = 18342461 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 (18342497) 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, 705468 + ... + 705493.

It is an arithmetic number, because the mean of its divisors is an integer number (4938367).

Almost surely, 2^18342493 is an apocalyptic number.

18342493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18342493 is a deficient number, since it is larger than the sum of its proper divisors (1410975).

18342493 is a wasteful number, since it uses less digits than its factorization.

18342493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410974.

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

The square root of 18342493 is about 4282.8136779458. The cubic root of 18342493 is about 263.7259025774.

The spelling of 18342493 in words is "eighteen million, three hundred forty-two thousand, four hundred ninety-three".