190697209 has 12 divisors (see below), whose sum is σ = 202112064. Its totient is φ = 179586264.

The previous prime is 190697201. The next prime is 190697249. The reversal of 190697209 is 902796091.

It is not a de Polignac number, because 190697209 - 2³ = 190697201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190697201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102324 + ... + 104170.

It is an arithmetic number, because the mean of its divisors is an integer number (16842672).

Almost surely, 2^190697209 is an apocalyptic number.

It is an amenable number.

190697209 is a deficient number, since it is larger than the sum of its proper divisors (11414855).

190697209 is an equidigital number, since it uses as much as digits as its factorization.

190697209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004 (or 1937 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 190697209 is about 13809.3160221642. The cubic root of 190697209 is about 575.5920394822.

The spelling of 190697209 in words is "one hundred ninety million, six hundred ninety-seven thousand, two hundred nine".