190394209 has 4 divisors (see below), whose sum is σ = 191893504. Its totient is φ = 188894916.

The previous prime is 190394189. The next prime is 190394213. The reversal of 190394209 is 902493091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 190394209 - 2¹⁵ = 190361441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190394249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749457 + ... + 749710.

It is an arithmetic number, because the mean of its divisors is an integer number (47973376).

Almost surely, 2^190394209 is an apocalyptic number.

It is an amenable number.

190394209 is a deficient number, since it is larger than the sum of its proper divisors (1499295).

190394209 is a wasteful number, since it uses less digits than its factorization.

190394209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499294.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 190394209 is about 13798.3408060535. The cubic root of 190394209 is about 575.2870239356.

The spelling of 190394209 in words is "one hundred ninety million, three hundred ninety-four thousand, two hundred nine".