3981001939 has 4 divisors (see below), whose sum is σ = 4088596624. Its totient is φ = 3873407256.

The previous prime is 3981001933. The next prime is 3981001987. The reversal of 3981001939 is 9391001893.

3981001939 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3981001939 - 2²³ = 3972613331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3981001895 and 3981001904.

It is not an unprimeable number, because it can be changed into a prime (3981001933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53797287 + ... + 53797360.

It is an arithmetic number, because the mean of its divisors is an integer number (1022149156).

Almost surely, 2^3981001939 is an apocalyptic number.

3981001939 is a deficient number, since it is larger than the sum of its proper divisors (107594685).

3981001939 is a wasteful number, since it uses less digits than its factorization.

3981001939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107594684.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 3981001939 is about 63095.1815830654. The cubic root of 3981001939 is about 1584.8839342211.

The spelling of 3981001939 in words is "three billion, nine hundred eighty-one million, one thousand, nine hundred thirty-nine".