3971789730 has 192 divisors, whose sum is σ = 11608945920. Its totient is φ = 936849408.

The previous prime is 3971789687. The next prime is 3971789749. The reversal of 3971789730 is 379871793.

It is a happy number.

It is a super-2 number, since 2×3971789730² = 31550227318666945800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2075254 + ... + 2077166.

It is an arithmetic number, because the mean of its divisors is an integer number (60463260).

Almost surely, 2^3971789730 is an apocalyptic number.

3971789730 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3971789730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5804472960).

3971789730 is an abundant number, since it is smaller than the sum of its proper divisors (7637156190).

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

3971789730 is a wasteful number, since it uses less digits than its factorization.

3971789730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025 (or 2022 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The square root of 3971789730 is about 63022.1368250871. The cubic root of 3971789730 is about 1583.6604936015.

The spelling of 3971789730 in words is "three billion, nine hundred seventy-one million, seven hundred eighty-nine thousand, seven hundred thirty".