3956649 has 4 divisors (see below), whose sum is σ = 5275536. Its totient is φ = 2637764.

The previous prime is 3956647. The next prime is 3956651. The reversal of 3956649 is 9466593.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (3956647) and next prime (3956651).

It is a cyclic number.

It is not a de Polignac number, because 3956649 - 2¹ = 3956647 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3956649.

It is not an unprimeable number, because it can be changed into a prime (3956647) 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, 659439 + ... + 659444.

It is an arithmetic number, because the mean of its divisors is an integer number (1318884).

Almost surely, 2^3956649 is an apocalyptic number.

It is an amenable number.

3956649 is a deficient number, since it is larger than the sum of its proper divisors (1318887).

3956649 is a wasteful number, since it uses less digits than its factorization.

3956649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318886.

The product of its digits is 174960, while the sum is 42.

The square root of 3956649 is about 1989.1327255867. The cubic root of 3956649 is about 158.1645590953.

The spelling of 3956649 in words is "three million, nine hundred fifty-six thousand, six hundred forty-nine".