16398087 has 4 divisors (see below), whose sum is σ = 21864120. Its totient is φ = 10932056.

The previous prime is 16398017. The next prime is 16398091. The reversal of 16398087 is 78089361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16398087 - 2⁸ = 16397831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16398017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2733012 + ... + 2733017.

It is an arithmetic number, because the mean of its divisors is an integer number (5466030).

Almost surely, 2^16398087 is an apocalyptic number.

16398087 is a deficient number, since it is larger than the sum of its proper divisors (5466033).

16398087 is an equidigital number, since it uses as much as digits as its factorization.

16398087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5466032.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 16398087 is about 4049.4551485354. The cubic root of 16398087 is about 254.0569395154.

The spelling of 16398087 in words is "sixteen million, three hundred ninety-eight thousand, eighty-seven".