1142840 has 16 divisors (see below), whose sum is σ = 2571480. Its totient is φ = 457120.

The previous prime is 1142837. The next prime is 1142851. The reversal of 1142840 is 482411.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14246 + ... + 14325.

2^1142840 is an apocalyptic number.

1142840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142840 is an abundant number, since it is smaller than the sum of its proper divisors (1428640).

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

1142840 is a wasteful number, since it uses less digits than its factorization.

1142840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28582 (or 28578 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1142840 is about 1069.0369497824. The cubic root of 1142840 is about 104.5510689544.

The spelling of 1142840 in words is "one million, one hundred forty-two thousand, eight hundred forty".