23019309 has 40 divisors (see below), whose sum is σ = 37069560. Its totient is φ = 14183424.

The previous prime is 23019307. The next prime is 23019313. The reversal of 23019309 is 90391032.

It can be written as a sum of positive squares in 4 ways, for example, as 12638025 + 10381284 = 3555^2 + 3222^2 .

It is not a de Polignac number, because 23019309 - 2¹ = 23019307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23019307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 100407 + ... + 100635.

It is an arithmetic number, because the mean of its divisors is an integer number (926739).

Almost surely, 2^23019309 is an apocalyptic number.

It is an amenable number.

23019309 is a deficient number, since it is larger than the sum of its proper divisors (14050251).

23019309 is a wasteful number, since it uses less digits than its factorization.

23019309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 23019309 is about 4797.8442033897. The cubic root of 23019309 is about 284.4662586634.

The spelling of 23019309 in words is "twenty-three million, nineteen thousand, three hundred nine".