16398139 has 2 divisors, whose sum is σ = 16398140. Its totient is φ = 16398138.

The previous prime is 16398133. The next prime is 16398157. The reversal of 16398139 is 93189361.

It is a weak prime.

It is an emirp because it is prime and its reverse (93189361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16398139 - 2³ = 16398131 is a prime.

It is not a weakly prime, because it can be changed into another prime (16398131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199069 + 8199070.

It is an arithmetic number, because the mean of its divisors is an integer number (8199070).

Almost surely, 2^16398139 is an apocalyptic number.

16398139 is a deficient number, since it is larger than the sum of its proper divisors (1).

16398139 is an equidigital number, since it uses as much as digits as its factorization.

16398139 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 16398139 is about 4049.4615691472. The cubic root of 16398139 is about 254.0572080619.

The spelling of 16398139 in words is "sixteen million, three hundred ninety-eight thousand, one hundred thirty-nine".