12398405 has 8 divisors (see below), whose sum is σ = 15224352. Its totient is φ = 9687888.

The previous prime is 12398381. The next prime is 12398413. The reversal of 12398405 is 50489321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12398405 - 2¹⁴ = 12382021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28619 + ... + 29048.

It is an arithmetic number, because the mean of its divisors is an integer number (1903044).

Almost surely, 2^12398405 is an apocalyptic number.

It is an amenable number.

12398405 is a deficient number, since it is larger than the sum of its proper divisors (2825947).

12398405 is an equidigital number, since it uses as much as digits as its factorization.

12398405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57715.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 12398405 is about 3521.1368902671. The cubic root of 12398405 is about 231.4489809154.

The spelling of 12398405 in words is "twelve million, three hundred ninety-eight thousand, four hundred five".