199931854 has 16 divisors (see below), whose sum is σ = 309754368. Its totient is φ = 96724152.

The previous prime is 199931821. The next prime is 199931861. The reversal of 199931854 is 458139991.

It is a junction number, because it is equal to n+sod(n) for n = 199931798 and 199931807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1662 + ... + 20065.

It is an arithmetic number, because the mean of its divisors is an integer number (19359648).

Almost surely, 2^199931854 is an apocalyptic number.

199931854 is a deficient number, since it is larger than the sum of its proper divisors (109822514).

199931854 is a wasteful number, since it uses less digits than its factorization.

199931854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21879.

The product of its digits is 349920, while the sum is 49.

The square root of 199931854 is about 14139.7260935281. The cubic root of 199931854 is about 584.7371200598.

The spelling of 199931854 in words is "one hundred ninety-nine million, nine hundred thirty-one thousand, eight hundred fifty-four".