9999811942 has 16 divisors (see below), whose sum is σ = 15447052800. Its totient is φ = 4852940040.

The previous prime is 9999811847. The next prime is 9999811951. The reversal of 9999811942 is 2491189999.

It is a super-2 number, since 2×9999811942² (a number of 21 digits) contains 22 as substring.

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, 527034 + ... + 545677.

It is an arithmetic number, because the mean of its divisors is an integer number (965440800).

Almost surely, 2^9999811942 is an apocalyptic number.

9999811942 is a deficient number, since it is larger than the sum of its proper divisors (5447240858).

9999811942 is a wasteful number, since it uses less digits than its factorization.

9999811942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072851.

The product of its digits is 3779136, while the sum is 61.

The square root of 9999811942 is about 99999.0597055792. The cubic root of 9999811942 is about 2154.4211846579.

The spelling of 9999811942 in words is "nine billion, nine hundred ninety-nine million, eight hundred eleven thousand, nine hundred forty-two".