1320240399 has 16 divisors (see below), whose sum is σ = 1829070720. Its totient is φ = 846053600.

The previous prime is 1320240371. The next prime is 1320240409. The reversal of 1320240399 is 9930420231.

It is a cyclic number.

It is not a de Polignac number, because 1320240399 - 2⁹ = 1320239887 is a prime.

It is a super-2 number, since 2×1320240399² = 3486069422303358402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320240499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13677 + ... + 53174.

It is an arithmetic number, because the mean of its divisors is an integer number (114316920).

Almost surely, 2^1320240399 is an apocalyptic number.

1320240399 is a deficient number, since it is larger than the sum of its proper divisors (508830321).

1320240399 is a wasteful number, since it uses less digits than its factorization.

1320240399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67110.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 1320240399 is about 36335.1124809047. The cubic root of 1320240399 is about 1097.0278994751.

The spelling of 1320240399 in words is "one billion, three hundred twenty million, two hundred forty thousand, three hundred ninety-nine".