3964581 has 6 divisors (see below), whose sum is σ = 5726630. Its totient is φ = 2643048.

The previous prime is 3964549. The next prime is 3964589. The reversal of 3964581 is 1854693.

3964581 is a `hidden beast` number, since 3 + 9 + 645 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3207681 + 756900 = 1791^2 + 870^2 .

It is not a de Polignac number, because 3964581 - 2⁵ = 3964549 is a prime.

It is a super-2 number, since 2×3964581² = 31435805011122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3964589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220246 + ... + 220263.

Almost surely, 2^3964581 is an apocalyptic number.

It is an amenable number.

3964581 is a deficient number, since it is larger than the sum of its proper divisors (1762049).

3964581 is a wasteful number, since it uses less digits than its factorization.

3964581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440515 (or 440512 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 3964581 is about 1991.1255610835. The cubic root of 3964581 is about 158.2701807855.

It can be divided in two parts, 39 and 64581, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 3964581 in words is "three million, nine hundred sixty-four thousand, five hundred eighty-one".