1340575381 has 4 divisors (see below), whose sum is σ = 1411132000. Its totient is φ = 1270018764.

The previous prime is 1340575349. The next prime is 1340575421. The reversal of 1340575381 is 1835750431.

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 a cyclic number.

It is not a de Polignac number, because 1340575381 - 2⁵ = 1340575349 is a prime.

It is a super-2 number, since 2×1340575381² = 3594284704286590322, 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 1340575381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340575321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35278281 + ... + 35278318.

It is an arithmetic number, because the mean of its divisors is an integer number (352783000).

Almost surely, 2^1340575381 is an apocalyptic number.

It is an amenable number.

1340575381 is a deficient number, since it is larger than the sum of its proper divisors (70556619).

1340575381 is an equidigital number, since it uses as much as digits as its factorization.

1340575381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70556618.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 1340575381 is about 36613.8686975304. The cubic root of 1340575381 is about 1102.6315455019.

The spelling of 1340575381 in words is "one billion, three hundred forty million, five hundred seventy-five thousand, three hundred eighty-one".