3971635 has 4 divisors (see below), whose sum is σ = 4765968. Its totient is φ = 3177304.

The previous prime is 3971621. The next prime is 3971651. The reversal of 3971635 is 5361793.

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 3971635 - 2¹⁹ = 3447347 is a prime.

It is a Duffinian number.

3971635 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3971635.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397159 + ... + 397168.

It is an arithmetic number, because the mean of its divisors is an integer number (1191492).

Almost surely, 2^3971635 is an apocalyptic number.

3971635 is a deficient number, since it is larger than the sum of its proper divisors (794333).

3971635 is an equidigital number, since it uses as much as digits as its factorization.

3971635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794332.

The product of its digits is 17010, while the sum is 34.

The square root of 3971635 is about 1992.8961337712. The cubic root of 3971635 is about 158.3639928316.

It can be divided in two parts, 3 and 971635, that multiplied together give a triangular number (2914905 = T₂₄₁₄).

The spelling of 3971635 in words is "three million, nine hundred seventy-one thousand, six hundred thirty-five".