9899887942 has 8 divisors (see below), whose sum is σ = 16971236496. Its totient is φ = 4242809112.

The previous prime is 9899887939. The next prime is 9899887961. The reversal of 9899887942 is 2497889989.

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

It is a congruent number.

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, 353567413 + ... + 353567440.

It is an arithmetic number, because the mean of its divisors is an integer number (2121404562).

Almost surely, 2^9899887942 is an apocalyptic number.

9899887942 is a deficient number, since it is larger than the sum of its proper divisors (7071348554).

9899887942 is a wasteful number, since it uses less digits than its factorization.

9899887942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707134862.

The product of its digits is 188116992, while the sum is 73.

The square root of 9899887942 is about 99498.1805964310. The cubic root of 9899887942 is about 2147.2210674999.

The spelling of 9899887942 in words is "nine billion, eight hundred ninety-nine million, eight hundred eighty-seven thousand, nine hundred forty-two".