3945650091 has 8 divisors (see below), whose sum is σ = 5264159184. Its totient is φ = 2628787200.

The previous prime is 3945650021. The next prime is 3945650101. The reversal of 3945650091 is 1900565493.

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

It is not a de Polignac number, because 3945650091 - 2⁷ = 3945649963 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3945650021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405946 + ... + 415551.

It is an arithmetic number, because the mean of its divisors is an integer number (658019898).

Almost surely, 2^3945650091 is an apocalyptic number.

3945650091 is a deficient number, since it is larger than the sum of its proper divisors (1318509093).

3945650091 is a wasteful number, since it uses less digits than its factorization.

3945650091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823101.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 3945650091 is about 62814.4098993217. The cubic root of 3945650091 is about 1580.1786492168.

The spelling of 3945650091 in words is "three billion, nine hundred forty-five million, six hundred fifty thousand, ninety-one".