3991431486 has 64 divisors (see below), whose sum is σ = 9299017728. Its totient is φ = 1118652768.

The previous prime is 3991431473. The next prime is 3991431487. The reversal of 3991431486 is 6841341993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991431487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 458571 + ... + 467193.

It is an arithmetic number, because the mean of its divisors is an integer number (145297152).

Almost surely, 2^3991431486 is an apocalyptic number.

3991431486 is an abundant number, since it is smaller than the sum of its proper divisors (5307586242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3991431486 is a wasteful number, since it uses less digits than its factorization.

3991431486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845.

The product of its digits is 559872, while the sum is 48.

The square root of 3991431486 is about 63177.7768364795. The cubic root of 3991431486 is about 1586.2667693111.

The spelling of 3991431486 in words is "three billion, nine hundred ninety-one million, four hundred thirty-one thousand, four hundred eighty-six".