18340337 has 4 divisors (see below), whose sum is σ = 18356976. Its totient is φ = 18323700.

The previous prime is 18340307. The next prime is 18340349. The reversal of 18340337 is 73304381.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73304381 = 23 ⋅3187147.

It is a cyclic number.

It is not a de Polignac number, because 18340337 - 2²⁰ = 17291761 is a prime.

It is a super-2 number, since 2×18340337² = 672735922547138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18340307) 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, 6539 + ... + 8912.

It is an arithmetic number, because the mean of its divisors is an integer number (4589244).

Almost surely, 2^18340337 is an apocalyptic number.

It is an amenable number.

18340337 is a deficient number, since it is larger than the sum of its proper divisors (16639).

18340337 is a wasteful number, since it uses less digits than its factorization.

18340337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16638.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 18340337 is about 4282.5619668605. The cubic root of 18340337 is about 263.7155692797.

The spelling of 18340337 in words is "eighteen million, three hundred forty thousand, three hundred thirty-seven".