3951939800985 has 16 divisors (see below), whose sum is σ = 6897931289280. Its totient is φ = 1916092024640.

The previous prime is 3951939800983. The next prime is 3951939801011. The reversal of 3951939800985 is 5890089391593.

It is not a de Polignac number, because 3951939800985 - 2¹ = 3951939800983 is a prime.

It is a super-2 number, since 2×3951939800985² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3951939800983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11975574990 + ... + 11975575319.

It is an arithmetic number, because the mean of its divisors is an integer number (431120705580).

Almost surely, 2^{3951939800985} is an apocalyptic number.

It is an amenable number.

3951939800985 is a deficient number, since it is larger than the sum of its proper divisors (2945991488295).

3951939800985 is a wasteful number, since it uses less digits than its factorization.

3951939800985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23951150328.

The product of its (nonzero) digits is 94478400, while the sum is 69.

The spelling of 3951939800985 in words is "three trillion, nine hundred fifty-one billion, nine hundred thirty-nine million, eight hundred thousand, nine hundred eighty-five".