3992189981 has 4 divisors (see below), whose sum is σ = 4299281532. Its totient is φ = 3685098432.

The previous prime is 3992189953. The next prime is 3992189989. The reversal of 3992189981 is 1899812993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2757300100 + 1234889881 = 52510^2 + 35141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3992189981 is a prime.

It is a super-2 number, since 2×3992189981² = 31875161688793560722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3992189981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3992189989) 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, 153545756 + ... + 153545781.

It is an arithmetic number, because the mean of its divisors is an integer number (1074820383).

Almost surely, 2^3992189981 is an apocalyptic number.

It is an amenable number.

3992189981 is a deficient number, since it is larger than the sum of its proper divisors (307091551).

3992189981 is a wasteful number, since it uses less digits than its factorization.

3992189981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307091550.

The product of its digits is 2519424, while the sum is 59.

The square root of 3992189981 is about 63183.7794137071. The cubic root of 3992189981 is about 1586.3672428055.

The spelling of 3992189981 in words is "three billion, nine hundred ninety-two million, one hundred eighty-nine thousand, nine hundred eighty-one".