3981738 has 16 divisors (see below), whose sum is σ = 7996320. Its totient is φ = 1321776.

The previous prime is 3981709. The next prime is 3981739. The reversal of 3981738 is 8371893.

3981738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3981696 and 3981705.

It is not an unprimeable number, because it can be changed into a prime (3981739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381 + ... + 2847.

It is an arithmetic number, because the mean of its divisors is an integer number (499770).

Almost surely, 2^3981738 is an apocalyptic number.

3981738 is an abundant number, since it is smaller than the sum of its proper divisors (4014582).

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

3981738 is a wasteful number, since it uses less digits than its factorization.

3981738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741.

The product of its digits is 36288, while the sum is 39.

The square root of 3981738 is about 1995.4292771231. The cubic root of 3981738 is about 158.4981606397.

The spelling of 3981738 in words is "three million, nine hundred eighty-one thousand, seven hundred thirty-eight".