969991399 has 8 divisors (see below), whose sum is σ = 1050077952. Its totient is φ = 890686560.

The previous prime is 969991343. The next prime is 969991409. The reversal of 969991399 is 993199969.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 969991399 - 2⁹ = 969990887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 969991399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (969991699) 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 7 ways as a sum of consecutive naturals, for example, 192844 + ... + 197809.

It is an arithmetic number, because the mean of its divisors is an integer number (131259744).

Almost surely, 2^969991399 is an apocalyptic number.

969991399 is a deficient number, since it is larger than the sum of its proper divisors (80086553).

969991399 is a wasteful number, since it uses less digits than its factorization.

969991399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390857.

The product of its digits is 9565938, while the sum is 64.

The square root of 969991399 is about 31144.6849237554. The cubic root of 969991399 is about 989.8953734277.

The spelling of 969991399 in words is "nine hundred sixty-nine million, nine hundred ninety-one thousand, three hundred ninety-nine".