190820109 has 8 divisors (see below), whose sum is σ = 260632512. Its totient is φ = 124110560.

The previous prime is 190820093. The next prime is 190820129. The reversal of 190820109 is 901028091.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 190820109 - 2⁴ = 190820093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190820129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775569 + ... + 775814.

It is an arithmetic number, because the mean of its divisors is an integer number (32579064).

Almost surely, 2^190820109 is an apocalyptic number.

It is an amenable number.

190820109 is a deficient number, since it is larger than the sum of its proper divisors (69812403).

190820109 is a wasteful number, since it uses less digits than its factorization.

190820109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551427.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 190820109 is about 13813.7651999735. The cubic root of 190820109 is about 575.7156649068.

The spelling of 190820109 in words is "one hundred ninety million, eight hundred twenty thousand, one hundred nine".