16398643 has 2 divisors, whose sum is σ = 16398644. Its totient is φ = 16398642.

The previous prime is 16398623. The next prime is 16398649. The reversal of 16398643 is 34689361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16398643 - 2⁵ = 16398611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16398596 and 16398605.

It is not a weakly prime, because it can be changed into another prime (16398649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199321 + 8199322.

It is an arithmetic number, because the mean of its divisors is an integer number (8199322).

Almost surely, 2^16398643 is an apocalyptic number.

16398643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16398643 is an equidigital number, since it uses as much as digits as its factorization.

16398643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 16398643 is about 4049.5237991645. The cubic root of 16398643 is about 254.0598108679.

The spelling of 16398643 in words is "sixteen million, three hundred ninety-eight thousand, six hundred forty-three".