16401694 has 4 divisors (see below), whose sum is σ = 24602544. Its totient is φ = 8200846.

The previous prime is 16401641. The next prime is 16401701. The reversal of 16401694 is 49610461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49610461 = 941 ⋅52721.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100422 + ... + 4100425.

It is an arithmetic number, because the mean of its divisors is an integer number (6150636).

Almost surely, 2^16401694 is an apocalyptic number.

16401694 is a deficient number, since it is larger than the sum of its proper divisors (8200850).

16401694 is an equidigital number, since it uses as much as digits as its factorization.

16401694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8200849.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 16401694 is about 4049.9004926047. The cubic root of 16401694 is about 254.0755660011.

The spelling of 16401694 in words is "sixteen million, four hundred one thousand, six hundred ninety-four".