6840387 has 6 divisors (see below), whose sum is σ = 9880572. Its totient is φ = 4560252.

The previous prime is 6840377. The next prime is 6840413. The reversal of 6840387 is 7830486.

6840387 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6840387 - 2⁴ = 6840371 is a prime.

6840387 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (6840377) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 380013 + ... + 380030.

It is an arithmetic number, because the mean of its divisors is an integer number (1646762).

Almost surely, 2^6840387 is an apocalyptic number.

6840387 is a deficient number, since it is larger than the sum of its proper divisors (3040185).

6840387 is a wasteful number, since it uses less digits than its factorization.

6840387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760049 (or 760046 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 6840387 is about 2615.4133516521. The cubic root of 6840387 is about 189.8279791146.

Subtracting 6840387 from its reverse (7830486), we obtain a palindrome (990099).

It can be divided in two parts, 6840 and 387, that added together give a palindrome (7227).

The spelling of 6840387 in words is "six million, eight hundred forty thousand, three hundred eighty-seven".