9809156972 has 12 divisors (see below), whose sum is σ = 17447435376. Its totient is φ = 4824175440.

The previous prime is 9809156969. The next prime is 9809157023. The reversal of 9809156972 is 2796519089.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20100488 + ... + 20100975.

It is an arithmetic number, because the mean of its divisors is an integer number (1453952948).

Almost surely, 2^9809156972 is an apocalyptic number.

It is an amenable number.

9809156972 is a deficient number, since it is larger than the sum of its proper divisors (7638278404).

9809156972 is a wasteful number, since it uses less digits than its factorization.

9809156972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40201528 (or 40201526 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 56.

The square root of 9809156972 is about 99041.1882602385. The cubic root of 9809156972 is about 2140.6412737376.

The spelling of 9809156972 in words is "nine billion, eight hundred nine million, one hundred fifty-six thousand, nine hundred seventy-two".