1142865 has 24 divisors (see below), whose sum is σ = 2007720. Its totient is φ = 601344.

The previous prime is 1142863. The next prime is 1142881. The reversal of 1142865 is 5682411.

It can be written as a sum of positive squares in 4 ways, for example, as 77841 + 1065024 = 279^2 + 1032^2 .

It is not a de Polignac number, because 1142865 - 2¹ = 1142863 is a prime.

It is a super-2 number, since 2×1142865² = 2612280816450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1142863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4789 + ... + 5021.

It is an arithmetic number, because the mean of its divisors is an integer number (83655).

2^1142865 is an apocalyptic number.

1142865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1142865 is a deficient number, since it is larger than the sum of its proper divisors (864855).

1142865 is a wasteful number, since it uses less digits than its factorization.

1142865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 350 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1142865 is about 1069.0486424855. The cubic root of 1142865 is about 104.5518313118.

The spelling of 1142865 in words is "one million, one hundred forty-two thousand, eight hundred sixty-five".