3217909905 has 24 divisors (see below), whose sum is σ = 6374526912. Its totient is φ = 1471044384.

The previous prime is 3217909897. The next prime is 3217909907. The reversal of 3217909905 is 5099097123.

It is a happy number.

It is not a de Polignac number, because 3217909905 - 2³ = 3217909897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (3217909907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5107479 + ... + 5108108.

It is an arithmetic number, because the mean of its divisors is an integer number (265605288).

Almost surely, 2^3217909905 is an apocalyptic number.

3217909905 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3217909905 is a deficient number, since it is larger than the sum of its proper divisors (3156617007).

3217909905 is a wasteful number, since it uses less digits than its factorization.

3217909905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10215605 (or 10215602 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 3217909905 is about 56726.6243046420. The cubic root of 3217909905 is about 1476.3566803301.

The spelling of 3217909905 in words is "three billion, two hundred seventeen million, nine hundred nine thousand, nine hundred five".