3997780 has 12 divisors (see below), whose sum is σ = 8395380. Its totient is φ = 1599104.

The previous prime is 3997769. The next prime is 3997801. The reversal of 3997780 is 877993.

It can be written as a sum of positive squares in 2 ways, for example, as 1295044 + 2702736 = 1138^2 + 1644^2 .

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, 99925 + ... + 99964.

It is an arithmetic number, because the mean of its divisors is an integer number (699615).

Almost surely, 2^3997780 is an apocalyptic number.

It is an amenable number.

3997780 is an abundant number, since it is smaller than the sum of its proper divisors (4397600).

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

3997780 is a wasteful number, since it uses less digits than its factorization.

3997780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199898 (or 199896 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 3997780 is about 1999.4449229724. Note that the first 3 decimals coincide. The cubic root of 3997780 is about 158.7107328428.

The spelling of 3997780 in words is "three million, nine hundred ninety-seven thousand, seven hundred eighty".