16399026 has 36 divisors (see below), whose sum is σ = 41334462. Its totient is φ = 4685184.

The previous prime is 16399021. The next prime is 16399027. The reversal of 16399026 is 62099361.

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 2893401 = 3675^2 + 1701^2 .

It is not an unprimeable number, because it can be changed into a prime (16399021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8415 + ... + 10178.

Almost surely, 2^16399026 is an apocalyptic number.

16399026 is an abundant number, since it is smaller than the sum of its proper divisors (24935436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16399026 is a wasteful number, since it uses less digits than its factorization.

16399026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18615 (or 18605 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 16399026 is about 4049.5710883994. The cubic root of 16399026 is about 254.0617887581.

The spelling of 16399026 in words is "sixteen million, three hundred ninety-nine thousand, twenty-six".