1356731399 has 16 divisors (see below), whose sum is σ = 1436227584. Its totient is φ = 1279605600.

The previous prime is 1356731371. The next prime is 1356731417. The reversal of 1356731399 is 9931376531.

It is a happy number.

It is not a de Polignac number, because 1356731399 - 2²⁴ = 1339954183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356730399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840317 + ... + 841929.

It is an arithmetic number, because the mean of its divisors is an integer number (89764224).

Almost surely, 2^1356731399 is an apocalyptic number.

1356731399 is a deficient number, since it is larger than the sum of its proper divisors (79496185).

1356731399 is a wasteful number, since it uses less digits than its factorization.

1356731399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318.

The product of its digits is 459270, while the sum is 47.

The square root of 1356731399 is about 36833.8349754679. The cubic root of 1356731399 is about 1107.0433445919.

The spelling of 1356731399 in words is "one billion, three hundred fifty-six million, seven hundred thirty-one thousand, three hundred ninety-nine".