840747 has 4 divisors (see below), whose sum is σ = 1121000. Its totient is φ = 560496.

The previous prime is 840743. The next prime is 840757. The reversal of 840747 is 747048.

840747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 840747 - 2² = 840743 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (840743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140122 + ... + 140127.

It is an arithmetic number, because the mean of its divisors is an integer number (280250).

2⁸⁴⁰⁷⁴⁷ is an apocalyptic number.

840747 is a deficient number, since it is larger than the sum of its proper divisors (280253).

840747 is a wasteful number, since it uses less digits than its factorization.

840747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280252.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 840747 is about 916.9225703406. The cubic root of 840747 is about 94.3818405053.

It can be divided in two parts, 8 and 40747, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 840747 in words is "eight hundred forty thousand, seven hundred forty-seven".