16398391 has 2 divisors, whose sum is σ = 16398392. Its totient is φ = 16398390.

The previous prime is 16398377. The next prime is 16398397. The reversal of 16398391 is 19389361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16398391 - 2⁹ = 16397879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16398397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199195 + 8199196.

It is an arithmetic number, because the mean of its divisors is an integer number (8199196).

Almost surely, 2^16398391 is an apocalyptic number.

16398391 is a deficient number, since it is larger than the sum of its proper divisors (1).

16398391 is an equidigital number, since it uses as much as digits as its factorization.

16398391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 16398391 is about 4049.4926842754. The cubic root of 16398391 is about 254.0585094716.

The spelling of 16398391 in words is "sixteen million, three hundred ninety-eight thousand, three hundred ninety-one".