7843921974 has 96 divisors (see below), whose sum is σ = 19700029440. Its totient is φ = 2209372416.

The previous prime is 7843921973. The next prime is 7843921991. The reversal of 7843921974 is 4791293487.

It is a super-2 number, since 2×7843921974² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7843921974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7843921973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3005182 + ... + 3007790.

It is an arithmetic number, because the mean of its divisors is an integer number (205208640).

Almost surely, 2^7843921974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7843921974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9850014720).

7843921974 is an abundant number, since it is smaller than the sum of its proper divisors (11856107466).

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

7843921974 is a wasteful number, since it uses less digits than its factorization.

7843921974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954 (or 2951 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 7843921974 is about 88565.9188062767. The cubic root of 7843921974 is about 1986.9079843956.

The spelling of 7843921974 in words is "seven billion, eight hundred forty-three million, nine hundred twenty-one thousand, nine hundred seventy-four".