840064 has 16 divisors (see below), whose sum is σ = 1673820. Its totient is φ = 419968.

The previous prime is 840061. The next prime is 840067. The reversal of 840064 is 460048.

It is an interprime number because it is at equal distance from previous prime (840061) and next prime (840067).

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840061) 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 as a sum of consecutive naturals, namely, 3154 + ... + 3409.

2⁸⁴⁰⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

840064 is a deficient number, since it is larger than the sum of its proper divisors (833756).

840064 is an equidigital number, since it uses as much as digits as its factorization.

840064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6577 (or 6565 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 840064 is about 916.5500531886. The cubic root of 840064 is about 94.3562758345.

It can be divided in two parts, 8400 and 64, that added together give a square (8464 = 92²).

The spelling of 840064 in words is "eight hundred forty thousand, sixty-four".