1040320399 has 2 divisors, whose sum is σ = 1040320400. Its totient is φ = 1040320398.

The previous prime is 1040320367. The next prime is 1040320417. The reversal of 1040320399 is 9930230401.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1040320399 - 2⁵ = 1040320367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1040320399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040320999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520160199 + 520160200.

It is an arithmetic number, because the mean of its divisors is an integer number (520160200).

Almost surely, 2^1040320399 is an apocalyptic number.

1040320399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040320399 is an equidigital number, since it uses as much as digits as its factorization.

1040320399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 1040320399 is about 32253.9981862714. The cubic root of 1040320399 is about 1013.2634364901.

The spelling of 1040320399 in words is "one billion, forty million, three hundred twenty thousand, three hundred ninety-nine".