1391338739 has 8 divisors (see below), whose sum is σ = 1596756480. Its totient is φ = 1187584776.

The previous prime is 1391338723. The next prime is 1391338801. The reversal of 1391338739 is 9378331931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1391338739 - 2⁴ = 1391338723 is a prime.

It is a super-2 number, since 2×1391338739² = 3871646973284220242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391338693 and 1391338702.

It is not an unprimeable number, because it can be changed into a prime (1391338339) 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 7 ways as a sum of consecutive naturals, for example, 414149 + ... + 417494.

It is an arithmetic number, because the mean of its divisors is an integer number (199594560).

Almost surely, 2^1391338739 is an apocalyptic number.

1391338739 is a deficient number, since it is larger than the sum of its proper divisors (205417741).

1391338739 is an equidigital number, since it uses as much as digits as its factorization.

1391338739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831889.

The product of its digits is 367416, while the sum is 47.

The square root of 1391338739 is about 37300.6533320799. The cubic root of 1391338739 is about 1116.3772022958.

The spelling of 1391338739 in words is "one billion, three hundred ninety-one million, three hundred thirty-eight thousand, seven hundred thirty-nine".