3661820 has 12 divisors (see below), whose sum is σ = 7689864. Its totient is φ = 1464720.

The previous prime is 3661781. The next prime is 3661831. The reversal of 3661820 is 281663.

It is a self number, because there is not a number n which added to its sum of digits gives 3661820.

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, 91526 + ... + 91565.

It is an arithmetic number, because the mean of its divisors is an integer number (640822).

Almost surely, 2^3661820 is an apocalyptic number.

It is an amenable number.

3661820 is an abundant number, since it is smaller than the sum of its proper divisors (4028044).

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

3661820 is a wasteful number, since it uses less digits than its factorization.

3661820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183100 (or 183098 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 3661820 is about 1913.5882524723. The cubic root of 3661820 is about 154.1341946056.

The spelling of 3661820 in words is "three million, six hundred sixty-one thousand, eight hundred twenty".