190039309 has 4 divisors (see below), whose sum is σ = 190189404. Its totient is φ = 189889216.

The previous prime is 190039307. The next prime is 190039327. The reversal of 190039309 is 903930091.

It is a happy number.

190039309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116165284 + 73874025 = 10778^2 + 8595^2 .

It is a cyclic number.

It is not a de Polignac number, because 190039309 - 2¹ = 190039307 is a prime.

It is a super-2 number, since 2×190039309² = 72229877930394962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190039301) 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, 73132 + ... + 75685.

It is an arithmetic number, because the mean of its divisors is an integer number (47547351).

Almost surely, 2^190039309 is an apocalyptic number.

It is an amenable number.

190039309 is a deficient number, since it is larger than the sum of its proper divisors (150095).

190039309 is a wasteful number, since it uses less digits than its factorization.

190039309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150094.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 190039309 is about 13785.4745656434. The cubic root of 190039309 is about 574.9293513704.

It can be divided in two parts, 1900 and 39309, that added together give a square (41209 = 203²).

The spelling of 190039309 in words is "one hundred ninety million, thirty-nine thousand, three hundred nine".