3649943906 has 32 divisors (see below), whose sum is σ = 6564817920. Its totient is φ = 1488974400.

The previous prime is 3649943903. The next prime is 3649943917. The reversal of 3649943906 is 6093499463.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3649943903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42461 + ... + 95408.

It is an arithmetic number, because the mean of its divisors is an integer number (205150560).

Almost surely, 2^3649943906 is an apocalyptic number.

3649943906 is a deficient number, since it is larger than the sum of its proper divisors (2914874014).

3649943906 is a wasteful number, since it uses less digits than its factorization.

3649943906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137970.

The product of its (nonzero) digits is 3779136, while the sum is 53.

The square root of 3649943906 is about 60414.7656289421. The cubic root of 3649943906 is about 1539.6738368679.

It can be divided in two parts, 364994 and 3906, that multiplied together give a square (1425666564 = 37758²).

The spelling of 3649943906 in words is "three billion, six hundred forty-nine million, nine hundred forty-three thousand, nine hundred six".