199012878 has 24 divisors (see below), whose sum is σ = 453889800. Its totient is φ = 62846064.

The previous prime is 199012867. The next prime is 199012883. The reversal of 199012878 is 878210991.

It is a super-2 number, since 2×199012878² = 79212251219685768, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290613 + ... + 291296.

It is an arithmetic number, because the mean of its divisors is an integer number (18912075).

Almost surely, 2^199012878 is an apocalyptic number.

199012878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199012878 is an abundant number, since it is smaller than the sum of its proper divisors (254876922).

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

199012878 is a wasteful number, since it uses less digits than its factorization.

199012878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581936 (or 581933 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 199012878 is about 14107.1924208894. The cubic root of 199012878 is about 583.8398396578.

The spelling of 199012878 in words is "one hundred ninety-nine million, twelve thousand, eight hundred seventy-eight".