3981535 has 4 divisors (see below), whose sum is σ = 4777848. Its totient is φ = 3185224.

The previous prime is 3981517. The next prime is 3981539. The reversal of 3981535 is 5351893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3981535 - 2⁵ = 3981503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3981535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981539) 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 3 ways as a sum of consecutive naturals, for example, 398149 + ... + 398158.

It is an arithmetic number, because the mean of its divisors is an integer number (1194462).

Almost surely, 2^3981535 is an apocalyptic number.

3981535 is a deficient number, since it is larger than the sum of its proper divisors (796313).

3981535 is an equidigital number, since it uses as much as digits as its factorization.

3981535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796312.

The product of its digits is 16200, while the sum is 34.

The square root of 3981535 is about 1995.3784102270. The cubic root of 3981535 is about 158.4954670359.

The spelling of 3981535 in words is "three million, nine hundred eighty-one thousand, five hundred thirty-five".