7986399 has 4 divisors (see below), whose sum is σ = 10648536. Its totient is φ = 5324264.

The previous prime is 7986389. The next prime is 7986401. The reversal of 7986399 is 9936897.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7986399 - 2¹³ = 7978207 is a prime.

7986399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7986389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331064 + ... + 1331069.

It is an arithmetic number, because the mean of its divisors is an integer number (2662134).

Almost surely, 2^7986399 is an apocalyptic number.

7986399 is a deficient number, since it is larger than the sum of its proper divisors (2662137).

7986399 is a wasteful number, since it uses less digits than its factorization.

7986399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662136.

The product of its digits is 734832, while the sum is 51.

The square root of 7986399 is about 2826.0217621243. The cubic root of 7986399 is about 199.8865940409.

It can be divided in two parts, 7986 and 399, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 7986399 in words is "seven million, nine hundred eighty-six thousand, three hundred ninety-nine".