9660399 has 12 divisors (see below), whose sum is σ = 14983704. Its totient is φ = 5520144.

The previous prime is 9660397. The next prime is 9660401. The reversal of 9660399 is 9930669.

It is an interprime number because it is at equal distance from previous prime (9660397) and next prime (9660401).

It is not a de Polignac number, because 9660399 - 2¹ = 9660397 is a prime.

9660399 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9660399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9660397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32712 + ... + 33005.

It is an arithmetic number, because the mean of its divisors is an integer number (1248642).

Almost surely, 2^9660399 is an apocalyptic number.

9660399 is a deficient number, since it is larger than the sum of its proper divisors (5323305).

9660399 is a wasteful number, since it uses less digits than its factorization.

9660399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65734 (or 65727 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 9660399 is about 3108.1182409941. The cubic root of 9660399 is about 212.9765011877.

The spelling of 9660399 in words is "nine million, six hundred sixty thousand, three hundred ninety-nine".