9997156 has 48 divisors (see below), whose sum is σ = 20490624.
Its totient is φ = 4225536.
The previous prime is 9997133. The next prime is 9997177. The reversal of 9997156 is 6517999.
It can be divided in two parts, 9997 and 156, that added together give a triangular number (10153 = T142).
9997156 is a nontrivial binomial coefficient, being equal to C(4472, 2).
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37881 + ... + 38143.
It is an arithmetic number, because the mean of its divisors is an integer number (426888).
Almost surely, 29997156 is an apocalyptic number.
9997156 is the 4471-st triangular number and also the 2236-th hexagonal number.
9997156 is the 1491-st centered nonagonal number.
It is an amenable number.
9997156 is an abundant number, since it is smaller than the sum of its proper divisors (10493468).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9997156 is a wasteful number, since it uses less digits than its factorization.
9997156 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 340 (or 338 counting only the distinct ones).
The product of its digits is 153090, while the sum is 46.
The square root of 9997156 is about 3161.8279523086.
The cubic root of 9997156 is about 215.4230430258.
The spelling of 9997156 in words is "nine million, nine hundred ninety-seven thousand, one hundred fifty-six".