6857040 has 40 divisors (see below), whose sum is σ = 21257568. Its totient is φ = 1828480.

The previous prime is 6857033. The next prime is 6857041. The reversal of 6857040 is 407586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 6856989 and 6857007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6857041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14046 + ... + 14525.

Almost surely, 2^6857040 is an apocalyptic number.

6857040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6857040 is an abundant number, since it is smaller than the sum of its proper divisors (14400528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6857040 is a wasteful number, since it uses less digits than its factorization.

6857040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28587 (or 28581 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 6857040 is about 2618.5950431481. The cubic root of 6857040 is about 189.9819003996.

The spelling of 6857040 in words is "six million, eight hundred fifty-seven thousand, forty".