8391672 has 48 divisors (see below), whose sum is σ = 23517000. Its totient is φ = 2700096.

The previous prime is 8391667. The next prime is 8391679. The reversal of 8391672 is 2761938.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8391679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79 + ... + 4097.

Almost surely, 2^8391672 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 8391672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11758500).

8391672 is an abundant number, since it is smaller than the sum of its proper divisors (15125328).

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

8391672 is a wasteful number, since it uses less digits than its factorization.

8391672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060 (or 4053 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 8391672 is about 2896.8382764663. The cubic root of 8391672 is about 203.2120701905.

The spelling of 8391672 in words is "eight million, three hundred ninety-one thousand, six hundred seventy-two".