199881045 has 144 divisors (see below), whose sum is σ = 458115840. Its totient is φ = 79688448.

The previous prime is 199881043. The next prime is 199881061. The reversal of 199881045 is 540188991.

It is not a de Polignac number, because 199881045 - 2¹ = 199881043 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199881043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 544452 + ... + 544818.

It is an arithmetic number, because the mean of its divisors is an integer number (3181360).

Almost surely, 2^199881045 is an apocalyptic number.

199881045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199881045 is an abundant number, since it is smaller than the sum of its proper divisors (258234795).

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

199881045 is a wasteful number, since it uses less digits than its factorization.

199881045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 199881045 is about 14137.9293038266. The cubic root of 199881045 is about 584.6875824718.

The spelling of 199881045 in words is "one hundred ninety-nine million, eight hundred eighty-one thousand, forty-five".