1142856 has 128 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 311040.

The previous prime is 1142851. The next prime is 1142863. The reversal of 1142856 is 6582411.

1142856 = T₄₈ + T₄₉ + ... + T₁₉₀.

It is a super-2 number, since 2×1142856² = 2612239673472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142851) 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 31 ways as a sum of consecutive naturals, for example, 30870 + ... + 30906.

It is an arithmetic number, because the mean of its divisors is an integer number (29925).

2^1142856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1142856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1915200).

1142856 is an abundant number, since it is smaller than the sum of its proper divisors (2687544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1142856 is a wasteful number, since it uses less digits than its factorization.

1142856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 66 counting only the distinct ones).

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

The square root of 1142856 is about 1069.0444331271. The cubic root of 1142856 is about 104.5515568644.

The spelling of 1142856 in words is "one million, one hundred forty-two thousand, eight hundred fifty-six".