4391631 has 16 divisors (see below), whose sum is σ = 6539520. Its totient is φ = 2912760.

The previous prime is 4391617. The next prime is 4391657. The reversal of 4391631 is 1361934.

It is not a de Polignac number, because 4391631 - 2⁷ = 4391503 is a prime.

It is a super-2 number, since 2×4391631² = 38572845680322, 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 = 4391595 and 4391604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4391671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8136 + ... + 8658.

It is an arithmetic number, because the mean of its divisors is an integer number (408720).

Almost surely, 2^4391631 is an apocalyptic number.

4391631 is a deficient number, since it is larger than the sum of its proper divisors (2147889).

4391631 is a wasteful number, since it uses less digits than its factorization.

4391631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 837 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 4391631 is about 2095.6218647456. The cubic root of 4391631 is about 163.7602957612.

The spelling of 4391631 in words is "four million, three hundred ninety-one thousand, six hundred thirty-one".