6181820 has 12 divisors (see below), whose sum is σ = 12981864. Its totient is φ = 2472720.

The previous prime is 6181811. The next prime is 6181831. The reversal of 6181820 is 281816.

It is a self number, because there is not a number n which added to its sum of digits gives 6181820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154526 + ... + 154565.

It is an arithmetic number, because the mean of its divisors is an integer number (1081822).

Almost surely, 2^6181820 is an apocalyptic number.

It is an amenable number.

6181820 is an abundant number, since it is smaller than the sum of its proper divisors (6800044).

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

6181820 is a wasteful number, since it uses less digits than its factorization.

6181820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309100 (or 309098 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 6181820 is about 2486.3266076684. The cubic root of 6181820 is about 183.5293184228.

The spelling of 6181820 in words is "six million, one hundred eighty-one thousand, eight hundred twenty".