9999431 has 8 divisors (see below), whose sum is σ = 10804080. Its totient is φ = 9199872.

The previous prime is 9999419. The next prime is 9999433. The reversal of 9999431 is 1349999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999431 is a prime.

It is a super-2 number, since 2×9999431² = 199977240647522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999433) 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, 3500 + ... + 5678.

It is an arithmetic number, because the mean of its divisors is an integer number (1350510).

Almost surely, 2^9999431 is an apocalyptic number.

9999431 is a deficient number, since it is larger than the sum of its proper divisors (804649).

9999431 is a wasteful number, since it uses less digits than its factorization.

9999431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545.

The product of its digits is 78732, while the sum is 44.

The square root of 9999431 is about 3162.1876920891. The cubic root of 9999431 is about 215.4393826812.

The spelling of 9999431 in words is "nine million, nine hundred ninety-nine thousand, four hundred thirty-one".