1042840 has 48 divisors (see below), whose sum is σ = 2508480. Its totient is φ = 389760.

The previous prime is 1042837. The next prime is 1042849. The reversal of 1042840 is 482401.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33625 + ... + 33655.

It is an arithmetic number, because the mean of its divisors is an integer number (52260).

2^1042840 is an apocalyptic number.

1042840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1042840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254240).

1042840 is an abundant number, since it is smaller than the sum of its proper divisors (1465640).

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

1042840 is a wasteful number, since it uses less digits than its factorization.

1042840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1042840 is about 1021.1953779762. The cubic root of 1042840 is about 101.4080800463.

The spelling of 1042840 in words is "one million, forty-two thousand, eight hundred forty".