9999252 has 18 divisors (see below), whose sum is σ = 25275978. Its totient is φ = 3333072.

The previous prime is 9999233. The next prime is 9999271. The reversal of 9999252 is 2529999.

It is an interprime number because it is at equal distance from previous prime (9999233) and next prime (9999271).

It can be written as a sum of positive squares in only one way, i.e., 6780816 + 3218436 = 2604^2 + 1794^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9999198 and 9999207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138843 + ... + 138914.

It is an arithmetic number, because the mean of its divisors is an integer number (1404221).

Almost surely, 2^9999252 is an apocalyptic number.

It is an amenable number.

9999252 is an abundant number, since it is smaller than the sum of its proper divisors (15276726).

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

9999252 is a wasteful number, since it uses less digits than its factorization.

9999252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277767 (or 277762 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 9999252 is about 3162.1593887722. The cubic root of 9999252 is about 215.4380971454.

The spelling of 9999252 in words is "nine million, nine hundred ninety-nine thousand, two hundred fifty-two".