3981864309 has 8 divisors (see below), whose sum is σ = 5310088992. Its totient is φ = 2654107920.

The previous prime is 3981864241. The next prime is 3981864317. The reversal of 3981864309 is 9034681893.

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

It is not a de Polignac number, because 3981864309 - 2¹⁹ = 3981340021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981864319) 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, 96727 + ... + 131604.

It is an arithmetic number, because the mean of its divisors is an integer number (663761124).

Almost surely, 2^3981864309 is an apocalyptic number.

It is an amenable number.

3981864309 is a deficient number, since it is larger than the sum of its proper divisors (1328224683).

3981864309 is a wasteful number, since it uses less digits than its factorization.

3981864309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234147.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 3981864309 is about 63102.0150946069. The cubic root of 3981864309 is about 1584.9983658559.

The spelling of 3981864309 in words is "three billion, nine hundred eighty-one million, eight hundred sixty-four thousand, three hundred nine".