1399339931 has 4 divisors (see below), whose sum is σ = 1526552664. Its totient is φ = 1272127200.

The previous prime is 1399339913. The next prime is 1399339933.

It is a happy number.

1399339931 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1399339931 - 2¹⁰ = 1399338907 is a prime.

It is a super-2 number, since 2×1399339931² = 3916304484982169522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1399339931.

It is not an unprimeable number, because it can be changed into a prime (1399339933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63606350 + ... + 63606371.

It is an arithmetic number, because the mean of its divisors is an integer number (381638166).

Almost surely, 2^1399339931 is an apocalyptic number.

1399339931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1399339931 is a deficient number, since it is larger than the sum of its proper divisors (127212733).

1399339931 is a wasteful number, since it uses less digits than its factorization.

1399339931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127212732.

The product of its digits is 531441, while the sum is 50.

The square root of 1399339931 is about 37407.7522847872. The cubic root of 1399339931 is about 1118.5131020885.

The spelling of 1399339931 in words is "one billion, three hundred ninety-nine million, three hundred thirty-nine thousand, nine hundred thirty-one".