9939947942 has 16 divisors (see below), whose sum is σ = 15432185472. Its totient is φ = 4796746560.

The previous prime is 9939947929. The next prime is 9939947971. The reversal of 9939947942 is 2497499399.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191783 + ... + 238034.

It is an arithmetic number, because the mean of its divisors is an integer number (964511592).

Almost surely, 2^9939947942 is an apocalyptic number.

9939947942 is a deficient number, since it is larger than the sum of its proper divisors (5492237530).

9939947942 is a wasteful number, since it uses less digits than its factorization.

9939947942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430223.

The product of its digits is 39680928, while the sum is 65.

The square root of 9939947942 is about 99699.2875701727. The cubic root of 9939947942 is about 2150.1134205174.

The spelling of 9939947942 in words is "nine billion, nine hundred thirty-nine million, nine hundred forty-seven thousand, nine hundred forty-two".