8391192420 has 96 divisors (see below), whose sum is σ = 25526858112. Its totient is φ = 2047223808.

The previous prime is 8391192379. The next prime is 8391192431. The reversal of 8391192420 is 242911938.

It is a super-2 number, since 2×8391192420² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40539 + ... + 135741.

It is an arithmetic number, because the mean of its divisors is an integer number (265904772).

Almost surely, 2^8391192420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8391192420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12763429056).

8391192420 is an abundant number, since it is smaller than the sum of its proper divisors (17135665692).

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

8391192420 is a wasteful number, since it uses less digits than its factorization.

8391192420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95341 (or 95339 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 8391192420 is about 91603.4520091901. The cubic root of 8391192420 is about 2032.0819895953.

The spelling of 8391192420 in words is "eight billion, three hundred ninety-one million, one hundred ninety-two thousand, four hundred twenty".