199442790 has 32 divisors (see below), whose sum is σ = 531848160. Its totient is φ = 53184672.

The previous prime is 199442779. The next prime is 199442797. The reversal of 199442790 is 97244991.

It is a happy number.

199442790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (199442797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369069 + ... + 369608.

It is an arithmetic number, because the mean of its divisors is an integer number (16620255).

Almost surely, 2^199442790 is an apocalyptic number.

199442790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199442790 is an abundant number, since it is smaller than the sum of its proper divisors (332405370).

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

199442790 is a wasteful number, since it uses less digits than its factorization.

199442790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738693 (or 738687 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 199442790 is about 14122.4215345669. The cubic root of 199442790 is about 584.2599451871.

The spelling of 199442790 in words is "one hundred ninety-nine million, four hundred forty-two thousand, seven hundred ninety".