3640906 has 8 divisors (see below), whose sum is σ = 5471460. Its totient is φ = 1817088.

The previous prime is 3640891. The next prime is 3640909. The reversal of 3640906 is 6090463.

It can be written as a sum of positive squares in 2 ways, for example, as 3629025 + 11881 = 1905^2 + 109^2 .

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

It is not an unprimeable number, because it can be changed into a prime (3640909) 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, 10 + ... + 2698.

Almost surely, 2^3640906 is an apocalyptic number.

3640906 is a deficient number, since it is larger than the sum of its proper divisors (1830554).

3640906 is a wasteful number, since it uses less digits than its factorization.

3640906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 3640906 is about 1908.1158245767. The cubic root of 3640906 is about 153.8401951667.

The spelling of 3640906 in words is "three million, six hundred forty thousand, nine hundred six".