840554 has 16 divisors (see below), whose sum is σ = 1481760. Its totient is φ = 352560.

The previous prime is 840547. The next prime is 840557. The reversal of 840554 is 455048.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (840557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (92610).

2⁸⁴⁰⁵⁵⁴ is an apocalyptic number.

840554 is a deficient number, since it is larger than the sum of its proper divisors (641206).

840554 is a wasteful number, since it uses less digits than its factorization.

840554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 840554 is about 916.8173209533. The cubic root of 840554 is about 94.3746179246.

The spelling of 840554 in words is "eight hundred forty thousand, five hundred fifty-four".