7920399399 has 32 divisors (see below), whose sum is σ = 12205209600. Its totient is φ = 4515302400.

The previous prime is 7920399397. The next prime is 7920399493. The reversal of 7920399399 is 9939930297.

It is not a de Polignac number, because 7920399399 - 2¹ = 7920399397 is a prime.

It is a super-2 number, since 2×7920399399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7920399397) 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 31 ways as a sum of consecutive naturals, for example, 1450827 + ... + 1456275.

It is an arithmetic number, because the mean of its divisors is an integer number (381412800).

Almost surely, 2^7920399399 is an apocalyptic number.

7920399399 is a deficient number, since it is larger than the sum of its proper divisors (4284810201).

7920399399 is a wasteful number, since it uses less digits than its factorization.

7920399399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8071.

The product of its (nonzero) digits is 7440174, while the sum is 60.

The square root of 7920399399 is about 88996.6257731157. The cubic root of 7920399399 is about 1993.3444932660.

The spelling of 7920399399 in words is "seven billion, nine hundred twenty million, three hundred ninety-nine thousand, three hundred ninety-nine".