16946399 has 4 divisors (see below), whose sum is σ = 17943264. Its totient is φ = 15949536.

The previous prime is 16946389. The next prime is 16946417. The reversal of 16946399 is 99364961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99364961 = 4603 ⋅21587.

It is not a de Polignac number, because 16946399 - 2⁴ = 16946383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16946329) 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, 498407 + ... + 498440.

It is an arithmetic number, because the mean of its divisors is an integer number (4485816).

Almost surely, 2^16946399 is an apocalyptic number.

16946399 is a deficient number, since it is larger than the sum of its proper divisors (996865).

16946399 is an equidigital number, since it uses as much as digits as its factorization.

16946399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996864.

The product of its digits is 314928, while the sum is 47.

The square root of 16946399 is about 4116.6004178205. The cubic root of 16946399 is about 256.8576328481.

The spelling of 16946399 in words is "sixteen million, nine hundred forty-six thousand, three hundred ninety-nine".