16399984 has 20 divisors (see below), whose sum is σ = 32105584. Its totient is φ = 8114688.

The previous prime is 16399979. The next prime is 16399987. The reversal of 16399984 is 48999361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399987) 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, 3732 + ... + 6835.

Almost surely, 2^16399984 is an apocalyptic number.

It is an amenable number.

16399984 is a deficient number, since it is larger than the sum of its proper divisors (15705600).

16399984 is a wasteful number, since it uses less digits than its factorization.

16399984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10672 (or 10666 counting only the distinct ones).

The product of its digits is 419904, while the sum is 49.

The square root of 16399984 is about 4049.6893708036. The cubic root of 16399984 is about 254.0667359311.

The spelling of 16399984 in words is "sixteen million, three hundred ninety-nine thousand, nine hundred eighty-four".