1391348785 has 4 divisors (see below), whose sum is σ = 1669618548. Its totient is φ = 1113079024.

The previous prime is 1391348779. The next prime is 1391348801. The reversal of 1391348785 is 5878431931.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 359140401 + 1032208384 = 18951^2 + 32128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391348785 - 2¹³ = 1391340593 is a prime.

It is a super-3 number, since 3×1391348785³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139134874 + ... + 139134883.

It is an arithmetic number, because the mean of its divisors is an integer number (417404637).

Almost surely, 2^1391348785 is an apocalyptic number.

It is an amenable number.

1391348785 is a deficient number, since it is larger than the sum of its proper divisors (278269763).

1391348785 is an equidigital number, since it uses as much as digits as its factorization.

1391348785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278269762.

The product of its digits is 725760, while the sum is 49.

The square root of 1391348785 is about 37300.7879943574. The cubic root of 1391348785 is about 1116.3798891801.

The spelling of 1391348785 in words is "one billion, three hundred ninety-one million, three hundred forty-eight thousand, seven hundred eighty-five".