99991926 has 96 divisors (see below), whose sum is σ = 241532928. Its totient is φ = 29756160.

The previous prime is 99991901. The next prime is 99991933. The reversal of 99991926 is 62919999.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 787275 + ... + 787401.

It is an arithmetic number, because the mean of its divisors is an integer number (2515968).

Almost surely, 2^99991926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99991926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120766464).

99991926 is an abundant number, since it is smaller than the sum of its proper divisors (141541002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99991926 is a wasteful number, since it uses less digits than its factorization.

99991926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 263 counting only the distinct ones).

The product of its digits is 708588, while the sum is 54.

The square root of 99991926 is about 9999.5962918510. The cubic root of 99991926 is about 464.1463909623.

The spelling of 99991926 in words is "ninety-nine million, nine hundred ninety-one thousand, nine hundred twenty-six".