1143781 has 8 divisors (see below), whose sum is σ = 1237280. Its totient is φ = 1053648.

The previous prime is 1143763. The next prime is 1143799. The reversal of 1143781 is 1873411.

It is an interprime number because it is at equal distance from previous prime (1143763) and next prime (1143799).

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

It is a cyclic number.

It is not a de Polignac number, because 1143781 - 2⁵ = 1143749 is a prime.

It is a super-2 number, since 2×1143781² = 2616469951922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 1516.

It is an arithmetic number, because the mean of its divisors is an integer number (154660).

2^1143781 is an apocalyptic number.

It is an amenable number.

1143781 is a deficient number, since it is larger than the sum of its proper divisors (93499).

1143781 is a wasteful number, since it uses less digits than its factorization.

1143781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683.

The product of its digits is 672, while the sum is 25.

The square root of 1143781 is about 1069.4769749742. The cubic root of 1143781 is about 104.5797564247.

The spelling of 1143781 in words is "one million, one hundred forty-three thousand, seven hundred eighty-one".