3639761 has 4 divisors (see below), whose sum is σ = 3765300. Its totient is φ = 3514224.

The previous prime is 3639743. The next prime is 3639763. The reversal of 3639761 is 1679363.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2907025 + 732736 = 1705^2 + 856^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639761 - 2¹⁴ = 3623377 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3639763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62726 + ... + 62783.

It is an arithmetic number, because the mean of its divisors is an integer number (941325).

Almost surely, 2^3639761 is an apocalyptic number.

It is an amenable number.

3639761 is a deficient number, since it is larger than the sum of its proper divisors (125539).

3639761 is a wasteful number, since it uses less digits than its factorization.

3639761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125538.

The product of its digits is 20412, while the sum is 35.

The square root of 3639761 is about 1907.8157667867. The cubic root of 3639761 is about 153.8240668100.

The spelling of 3639761 in words is "three million, six hundred thirty-nine thousand, seven hundred sixty-one".