2016399 has 48 divisors (see below), whose sum is σ = 3611520. Its totient is φ = 987840.

The previous prime is 2016397. The next prime is 2016401. The reversal of 2016399 is 9936102.

It is a Cunningham number, because it is equal to 1420²-1.

It is an interprime number because it is at equal distance from previous prime (2016397) and next prime (2016401).

It is not a de Polignac number, because 2016399 - 2¹ = 2016397 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2016397) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46872 + ... + 46914.

It is an arithmetic number, because the mean of its divisors is an integer number (75240).

2^2016399 is an apocalyptic number.

2016399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2016399 is a deficient number, since it is larger than the sum of its proper divisors (1595121).

2016399 is a wasteful number, since it uses less digits than its factorization.

2016399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 2016399 is about 1419.9996478873. Note that the first 3 decimals coincide. The cubic root of 2016399 is about 126.3355254890.

It can be divided in two parts, 2016 and 399, that added together give a triangular number (2415 = T₆₉).

The spelling of 2016399 in words is "two million, sixteen thousand, three hundred ninety-nine".