1340391773 has 4 divisors (see below), whose sum is σ = 1531876320. Its totient is φ = 1148907228.

The previous prime is 1340391719. The next prime is 1340391781. The reversal of 1340391773 is 3771930431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1340391773 - 2⁸ = 1340391517 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 (1340391713) 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, 95742263 + ... + 95742276.

It is an arithmetic number, because the mean of its divisors is an integer number (382969080).

Almost surely, 2^1340391773 is an apocalyptic number.

It is an amenable number.

1340391773 is a deficient number, since it is larger than the sum of its proper divisors (191484547).

1340391773 is an equidigital number, since it uses as much as digits as its factorization.

1340391773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191484546.

The product of its (nonzero) digits is 47628, while the sum is 38.

The square root of 1340391773 is about 36611.3612557632. The cubic root of 1340391773 is about 1102.5812036315.

The spelling of 1340391773 in words is "one billion, three hundred forty million, three hundred ninety-one thousand, seven hundred seventy-three".