9997861 has 8 divisors (see below), whose sum is σ = 10213184. Its totient is φ = 9784800.

The previous prime is 9997859. The next prime is 9997873. The reversal of 9997861 is 1687999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9997861 - 2¹ = 9997859 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10570 + ... + 11476.

It is an arithmetic number, because the mean of its divisors is an integer number (1276648).

Almost surely, 2^9997861 is an apocalyptic number.

It is an amenable number.

9997861 is a deficient number, since it is larger than the sum of its proper divisors (215323).

9997861 is a wasteful number, since it uses less digits than its factorization.

9997861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131.

The product of its digits is 244944, while the sum is 49.

The square root of 9997861 is about 3161.9394364851. The cubic root of 9997861 is about 215.4281067885.

The spelling of 9997861 in words is "nine million, nine hundred ninety-seven thousand, eight hundred sixty-one".