3981380 has 24 divisors (see below), whose sum is σ = 9004632. Its totient is φ = 1469952.

The previous prime is 3981343. The next prime is 3981389. The reversal of 3981380 is 831893.

It can be written as a sum of positive squares in 4 ways, for example, as 264196 + 3717184 = 514^2 + 1928^2 .

It is not an unprimeable number, because it can be changed into a prime (3981389) 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, 7397 + ... + 7916.

It is an arithmetic number, because the mean of its divisors is an integer number (375193).

Almost surely, 2^3981380 is an apocalyptic number.

It is an amenable number.

3981380 is an abundant number, since it is smaller than the sum of its proper divisors (5023252).

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

3981380 is a wasteful number, since it uses less digits than its factorization.

3981380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15335 (or 15333 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 3981380 is about 1995.3395700983. The cubic root of 3981380 is about 158.4934102817.

It can be divided in two parts, 39813 and 80, that added together give a palindrome (39893).

The spelling of 3981380 in words is "three million, nine hundred eighty-one thousand, three hundred eighty".