6840404 has 24 divisors (see below), whose sum is σ = 12520200. Its totient is φ = 3265920.

The previous prime is 6840377. The next prime is 6840413. The reversal of 6840404 is 4040486.

It can be written as a sum of positive squares in 4 ways, for example, as 1317904 + 5522500 = 1148^2 + 2350^2 .

It is a super-2 number, since 2×6840404² = 93582253766432, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12374 + ... + 12914.

It is an arithmetic number, because the mean of its divisors is an integer number (521675).

Almost surely, 2^6840404 is an apocalyptic number.

It is an amenable number.

6840404 is a deficient number, since it is larger than the sum of its proper divisors (5679796).

6840404 is a wasteful number, since it uses less digits than its factorization.

6840404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 681 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 6840404 is about 2615.4166016144. The cubic root of 6840404 is about 189.8281363705.

It can be divided in two parts, 68 and 40404, that multiplied together give a palindrome (2747472).

The spelling of 6840404 in words is "six million, eight hundred forty thousand, four hundred four".