16398427 has 4 divisors (see below), whose sum is σ = 16963920. Its totient is φ = 15832936.

The previous prime is 16398413. The next prime is 16398433. The reversal of 16398427 is 72489361.

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 16398427 - 2⁷ = 16398299 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16398427.

It is not an unprimeable number, because it can be changed into a prime (16398407) 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, 282703 + ... + 282760.

It is an arithmetic number, because the mean of its divisors is an integer number (4240980).

Almost surely, 2^16398427 is an apocalyptic number.

16398427 is a deficient number, since it is larger than the sum of its proper divisors (565493).

16398427 is an equidigital number, since it uses as much as digits as its factorization.

16398427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565492.

The product of its digits is 72576, while the sum is 40.

The square root of 16398427 is about 4049.4971292742. The cubic root of 16398427 is about 254.0586953861.

The spelling of 16398427 in words is "sixteen million, three hundred ninety-eight thousand, four hundred twenty-seven".