18345407 has 6 divisors (see below), whose sum is σ = 18576072. Its totient is φ = 18117572.

The previous prime is 18345403. The next prime is 18345461. The reversal of 18345407 is 70454381.

It is not a de Polignac number, because 18345407 - 2² = 18345403 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 (18345403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5558 + ... + 8220.

It is an arithmetic number, because the mean of its divisors is an integer number (3096012).

Almost surely, 2^18345407 is an apocalyptic number.

18345407 is a deficient number, since it is larger than the sum of its proper divisors (230665).

18345407 is an frugal number, since it uses more digits than its factorization.

18345407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 18345407 is about 4283.1538613503. The cubic root of 18345407 is about 263.7398675382.

Adding to 18345407 its reverse (70454381), we get a palindrome (88799788).

The spelling of 18345407 in words is "eighteen million, three hundred forty-five thousand, four hundred seven".