3981157836 has 12 divisors (see below), whose sum is σ = 9289368312. Its totient is φ = 1327052608.

The previous prime is 3981157793. The next prime is 3981157841. The reversal of 3981157836 is 6387511893.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165881565 + ... + 165881588.

It is an arithmetic number, because the mean of its divisors is an integer number (774114026).

Almost surely, 2^3981157836 is an apocalyptic number.

It is an amenable number.

3981157836 is an abundant number, since it is smaller than the sum of its proper divisors (5308210476).

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

3981157836 is a wasteful number, since it uses less digits than its factorization.

3981157836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331763160 (or 331763158 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 3981157836 is about 63096.4169822661. The cubic root of 3981157836 is about 1584.9046220973.

The spelling of 3981157836 in words is "three billion, nine hundred eighty-one million, one hundred fifty-seven thousand, eight hundred thirty-six".