3907981 has 8 divisors (see below), whose sum is σ = 4872384. Its totient is φ = 3045120.

The previous prime is 3907979. The next prime is 3907987. The reversal of 3907981 is 1897093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3907981 - 2¹ = 3907979 is a prime.

It is a super-2 number, since 2×3907981² = 30544630992722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3907981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3907987) 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, 25300 + ... + 25453.

It is an arithmetic number, because the mean of its divisors is an integer number (609048).

Almost surely, 2^3907981 is an apocalyptic number.

It is an amenable number.

3907981 is a deficient number, since it is larger than the sum of its proper divisors (964403).

3907981 is a wasteful number, since it uses less digits than its factorization.

3907981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50771.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 3907981 is about 1976.8614013127. The cubic root of 3907981 is about 157.5133909837.

The spelling of 3907981 in words is "three million, nine hundred seven thousand, nine hundred eighty-one".