3997980 has 144 divisors (see below), whose sum is σ = 14676480. Its totient is φ = 860544.

The previous prime is 3997979. The next prime is 3997993. The reversal of 3997980 is 897993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23857 + ... + 24023.

It is an arithmetic number, because the mean of its divisors is an integer number (101920).

Almost surely, 2^3997980 is an apocalyptic number.

3997980 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3997980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7338240).

3997980 is an abundant number, since it is smaller than the sum of its proper divisors (10678500).

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

3997980 is a wasteful number, since it uses less digits than its factorization.

3997980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 3997980 is about 1999.4949362276. The cubic root of 3997980 is about 158.7133794464.

The spelling of 3997980 in words is "three million, nine hundred ninety-seven thousand, nine hundred eighty".