3981615 has 32 divisors (see below), whose sum is σ = 7084800. Its totient is φ = 1893120.

The previous prime is 3981589. The next prime is 3981617. The reversal of 3981615 is 5161893.

It is not a de Polignac number, because 3981615 - 2¹⁰ = 3980591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9531 + ... + 9939.

It is an arithmetic number, because the mean of its divisors is an integer number (221400).

Almost surely, 2^3981615 is an apocalyptic number.

3981615 is a deficient number, since it is larger than the sum of its proper divisors (3103185).

3981615 is a wasteful number, since it uses less digits than its factorization.

3981615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its digits is 6480, while the sum is 33.

The square root of 3981615 is about 1995.3984564492. The cubic root of 3981615 is about 158.4965285656.

The spelling of 3981615 in words is "three million, nine hundred eighty-one thousand, six hundred fifteen".