1393731399 has 16 divisors (see below), whose sum is σ = 1875057408. Its totient is φ = 920813952.

The previous prime is 1393731379. The next prime is 1393731413. The reversal of 1393731399 is 9931373931.

It is not a de Polignac number, because 1393731399 - 2⁹ = 1393730887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393731319) 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, 169839 + ... + 177855.

It is an arithmetic number, because the mean of its divisors is an integer number (117191088).

Almost surely, 2^1393731399 is an apocalyptic number.

1393731399 is a deficient number, since it is larger than the sum of its proper divisors (481326009).

1393731399 is a wasteful number, since it uses less digits than its factorization.

1393731399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8534.

The product of its digits is 413343, while the sum is 48.

The square root of 1393731399 is about 37332.7121838208. The cubic root of 1393731399 is about 1117.0167736931.

The spelling of 1393731399 in words is "one billion, three hundred ninety-three million, seven hundred thirty-one thousand, three hundred ninety-nine".