99991854 has 16 divisors (see below), whose sum is σ = 222204240. Its totient is φ = 33330600.

The previous prime is 99991831. The next prime is 99991877. The reversal of 99991854 is 45819999.

It is an interprime number because it is at equal distance from previous prime (99991831) and next prime (99991877).

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1851701 = 99991854 / (9 + 9 + 9 + 9 + 1 + 8 + 5 + 4).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99991854.

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, 925797 + ... + 925904.

It is an arithmetic number, because the mean of its divisors is an integer number (13887765).

Almost surely, 2^99991854 is an apocalyptic number.

99991854 is an abundant number, since it is smaller than the sum of its proper divisors (122212386).

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

99991854 is a wasteful number, since it uses less digits than its factorization.

99991854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851712 (or 1851706 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 99991854 is about 9999.5926917050. The cubic root of 99991854 is about 464.1462795582.

The spelling of 99991854 in words is "ninety-nine million, nine hundred ninety-one thousand, eight hundred fifty-four".