18340407 has 24 divisors (see below), whose sum is σ = 28330848. Its totient is φ = 11404800.

The previous prime is 18340397. The next prime is 18340409. The reversal of 18340407 is 70404381.

It is not a de Polignac number, because 18340407 - 2⁴ = 18340391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18340409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7407 + ... + 9567.

It is an arithmetic number, because the mean of its divisors is an integer number (1180452).

Almost surely, 2^18340407 is an apocalyptic number.

18340407 is a deficient number, since it is larger than the sum of its proper divisors (9990441).

18340407 is a wasteful number, since it uses less digits than its factorization.

18340407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231 (or 2228 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18340407 is about 4282.5701395307. The cubic root of 18340407 is about 263.7159047891.

Adding to 18340407 its reverse (70404381), we get a palindrome (88744788).

The spelling of 18340407 in words is "eighteen million, three hundred forty thousand, four hundred seven".