16399249 has 4 divisors (see below), whose sum is σ = 16407664. Its totient is φ = 16390836.

The previous prime is 16399247. The next prime is 16399259. The reversal of 16399249 is 94299361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16399249 - 2¹ = 16399247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16399247) 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, 394 + ... + 5740.

It is an arithmetic number, because the mean of its divisors is an integer number (4101916).

Almost surely, 2^16399249 is an apocalyptic number.

It is an amenable number.

16399249 is a deficient number, since it is larger than the sum of its proper divisors (8415).

16399249 is an equidigital number, since it uses as much as digits as its factorization.

16399249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8414.

The product of its digits is 104976, while the sum is 43.

The square root of 16399249 is about 4049.5986220859. The cubic root of 16399249 is about 254.0629403615.

The spelling of 16399249 in words is "sixteen million, three hundred ninety-nine thousand, two hundred forty-nine".