9891429252 has 24 divisors (see below), whose sum is σ = 23642929632. Its totient is φ = 3216724800.

The previous prime is 9891429239. The next prime is 9891429307. The reversal of 9891429252 is 2529241989.

It is a junction number, because it is equal to n+sod(n) for n = 9891429195 and 9891429204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10051774 + ... + 10052757.

It is an arithmetic number, because the mean of its divisors is an integer number (985122068).

Almost surely, 2^9891429252 is an apocalyptic number.

It is an amenable number.

9891429252 is an abundant number, since it is smaller than the sum of its proper divisors (13751500380).

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

9891429252 is a wasteful number, since it uses less digits than its factorization.

9891429252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20104579 (or 20104577 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The square root of 9891429252 is about 99455.6647557091. The cubic root of 9891429252 is about 2146.6093483639.

The spelling of 9891429252 in words is "nine billion, eight hundred ninety-one million, four hundred twenty-nine thousand, two hundred fifty-two".