16399346 has 4 divisors (see below), whose sum is σ = 24599022. Its totient is φ = 8199672.

The previous prime is 16399343. The next prime is 16399363. The reversal of 16399346 is 64399361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64399361 = 13 ⋅4953797.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 4044121 = 3515^2 + 2011^2 .

It is not an unprimeable number, because it can be changed into a prime (16399343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4099835 + ... + 4099838.

Almost surely, 2^16399346 is an apocalyptic number.

16399346 is a deficient number, since it is larger than the sum of its proper divisors (8199676).

16399346 is an equidigital number, since it uses as much as digits as its factorization.

16399346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8199675.

The product of its digits is 104976, while the sum is 41.

The square root of 16399346 is about 4049.6105985638. The cubic root of 16399346 is about 254.0634412799.

The spelling of 16399346 in words is "sixteen million, three hundred ninety-nine thousand, three hundred forty-six".