16399493 has 6 divisors (see below), whose sum is σ = 18026022. Its totient is φ = 14908520.

The previous prime is 16399477. The next prime is 16399507. The reversal of 16399493 is 39499361.

It can be written as a sum of positive squares in only one way, i.e., 15856324 + 543169 = 3982^2 + 737^2 .

It is not a de Polignac number, because 16399493 - 2⁴ = 16399477 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 (16399433) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 67646 + ... + 67887.

It is an arithmetic number, because the mean of its divisors is an integer number (3004337).

Almost surely, 2^16399493 is an apocalyptic number.

It is an amenable number.

16399493 is a deficient number, since it is larger than the sum of its proper divisors (1626529).

16399493 is a wasteful number, since it uses less digits than its factorization.

16399493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135555 (or 135544 counting only the distinct ones).

The product of its digits is 157464, while the sum is 44.

The square root of 16399493 is about 4049.6287484163. The cubic root of 16399493 is about 254.0642003999.

The spelling of 16399493 in words is "sixteen million, three hundred ninety-nine thousand, four hundred ninety-three".