9871572 has 12 divisors (see below), whose sum is σ = 23033696. Its totient is φ = 3290520.

The previous prime is 9871523. The next prime is 9871573. The reversal of 9871572 is 2751789.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 9871572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9871573) 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, 411304 + ... + 411327.

Almost surely, 2^9871572 is an apocalyptic number.

It is an amenable number.

9871572 is an abundant number, since it is smaller than the sum of its proper divisors (13162124).

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

9871572 is a wasteful number, since it uses less digits than its factorization.

9871572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822638 (or 822636 counting only the distinct ones).

The product of its digits is 35280, while the sum is 39.

The square root of 9871572 is about 3141.9057910765. The cubic root of 9871572 is about 214.5171931600.

The spelling of 9871572 in words is "nine million, eight hundred seventy-one thousand, five hundred seventy-two".