3711981 has 16 divisors (see below), whose sum is σ = 6091904. Its totient is φ = 1957824.

The previous prime is 3711959. The next prime is 3711989. The reversal of 3711981 is 1891173.

It is not a de Polignac number, because 3711981 - 2¹⁵ = 3679213 is a prime.

It is a super-2 number, since 2×3711981² = 27557605888722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3711989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6526 + ... + 7071.

It is an arithmetic number, because the mean of its divisors is an integer number (380744).

Almost surely, 2^3711981 is an apocalyptic number.

It is an amenable number.

3711981 is a deficient number, since it is larger than the sum of its proper divisors (2379923).

3711981 is a wasteful number, since it uses less digits than its factorization.

3711981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13620.

The product of its digits is 1512, while the sum is 30.

The square root of 3711981 is about 1926.6502017751. The cubic root of 3711981 is about 154.8348014485.

The spelling of 3711981 in words is "three million, seven hundred eleven thousand, nine hundred eighty-one".