190348009 has 4 divisors (see below), whose sum is σ = 190495620. Its totient is φ = 190200400.

The previous prime is 190348007. The next prime is 190348021. The reversal of 190348009 is 900843091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900843091 = 5801 ⋅155291.

It can be written as a sum of positive squares in 2 ways, for example, as 51768025 + 138579984 = 7195^2 + 11772^2 .

It is a cyclic number.

It is not a de Polignac number, because 190348009 - 2¹ = 190348007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190348003) 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, 71854 + ... + 74455.

It is an arithmetic number, because the mean of its divisors is an integer number (47623905).

Almost surely, 2^190348009 is an apocalyptic number.

It is an amenable number.

190348009 is a deficient number, since it is larger than the sum of its proper divisors (147611).

190348009 is a wasteful number, since it uses less digits than its factorization.

190348009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147610.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 190348009 is about 13796.6665901587. Note that the first 3 decimals coincide. The cubic root of 190348009 is about 575.2404881880.

The spelling of 190348009 in words is "one hundred ninety million, three hundred forty-eight thousand, nine".