16399812 has 96 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 4337280.

The previous prime is 16399811. The next prime is 16399841. The reversal of 16399812 is 21899361.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32353 + ... + 32855.

It is an arithmetic number, because the mean of its divisors is an integer number (493920).

Almost surely, 2^16399812 is an apocalyptic number.

16399812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16399812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23708160).

16399812 is an abundant number, since it is smaller than the sum of its proper divisors (31016508).

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

16399812 is a wasteful number, since it uses less digits than its factorization.

16399812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553 (or 551 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 16399812 is about 4049.6681345513. The cubic root of 16399812 is about 254.0658477264.

The spelling of 16399812 in words is "sixteen million, three hundred ninety-nine thousand, eight hundred twelve".