3991305226 has 16 divisors (see below), whose sum is σ = 6074611200. Its totient is φ = 1966630720.

The previous prime is 3991305223. The next prime is 3991305233. The reversal of 3991305226 is 6225031993.

It is a super-2 number, since 2×3991305226² = 31861034814189822152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3991305221) 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, 7951 + ... + 89698.

It is an arithmetic number, because the mean of its divisors is an integer number (379663200).

Almost surely, 2^3991305226 is an apocalyptic number.

3991305226 is a deficient number, since it is larger than the sum of its proper divisors (2083305974).

3991305226 is a wasteful number, since it uses less digits than its factorization.

3991305226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97949.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 3991305226 is about 63176.7775848056. Note that the first 3 decimals coincide. The cubic root of 3991305226 is about 1586.2500431353.

The spelling of 3991305226 in words is "three billion, nine hundred ninety-one million, three hundred five thousand, two hundred twenty-six".