1343781 has 6 divisors (see below), whose sum is σ = 1941030. Its totient is φ = 895848.

The previous prime is 1343767. The next prime is 1343789. The reversal of 1343781 is 1873431.

It can be written as a sum of positive squares in only one way, i.e., 1083681 + 260100 = 1041^2 + 510^2 .

It is not a de Polignac number, because 1343781 - 2⁶ = 1343717 is a prime.

It is a super-2 number, since 2×1343781² = 3611494751922, which contains 22 as substring.

1343781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1343789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74646 + ... + 74663.

It is an arithmetic number, because the mean of its divisors is an integer number (323505).

2^1343781 is an apocalyptic number.

It is an amenable number.

1343781 is a deficient number, since it is larger than the sum of its proper divisors (597249).

1343781 is a wasteful number, since it uses less digits than its factorization.

1343781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149315 (or 149312 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1343781 is about 1159.2156831237. The cubic root of 1343781 is about 110.3509726384.

The spelling of 1343781 in words is "one million, three hundred forty-three thousand, seven hundred eighty-one".