3905631 has 32 divisors (see below), whose sum is σ = 6266880. Its totient is φ = 2395008.

The previous prime is 3905599. The next prime is 3905641. The reversal of 3905631 is 1365093.

It is not a de Polignac number, because 3905631 - 2⁵ = 3905599 is a prime.

It is a super-2 number, since 2×3905631² = 30507907016322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 3905595 and 3905604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3905641) 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, 30690 + ... + 30816.

It is an arithmetic number, because the mean of its divisors is an integer number (195840).

Almost surely, 2^3905631 is an apocalyptic number.

3905631 is a deficient number, since it is larger than the sum of its proper divisors (2361249).

3905631 is a wasteful number, since it uses less digits than its factorization.

3905631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 3905631 is about 1976.2669354113. The cubic root of 3905631 is about 157.4818119587.

The spelling of 3905631 in words is "three million, nine hundred five thousand, six hundred thirty-one".