3645631 has 8 divisors (see below), whose sum is σ = 4105728. Its totient is φ = 3207000.

The previous prime is 3645623. The next prime is 3645643. The reversal of 3645631 is 1365463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3645631 - 2³ = 3645623 is a prime.

It is a super-2 number, since 2×3645631² = 26581250776322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3645631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5005 + ... + 5686.

It is an arithmetic number, because the mean of its divisors is an integer number (513216).

Almost surely, 2^3645631 is an apocalyptic number.

3645631 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3645631 is a deficient number, since it is larger than the sum of its proper divisors (460097).

3645631 is a wasteful number, since it uses less digits than its factorization.

3645631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10733.

The product of its digits is 6480, while the sum is 28.

The square root of 3645631 is about 1909.3535555261. The cubic root of 3645631 is about 153.9067153043.

It can be divided in two parts, 364 and 5631, that added together give a palindrome (5995).

The spelling of 3645631 in words is "three million, six hundred forty-five thousand, six hundred thirty-one".