123021309 has 4 divisors (see below), whose sum is σ = 164028416. Its totient is φ = 82014204.

The previous prime is 123021307. The next prime is 123021331. The reversal of 123021309 is 903120321.

It is a happy number.

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 not a de Polignac number, because 123021309 - 2¹ = 123021307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123021307) 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, 20503549 + ... + 20503554.

It is an arithmetic number, because the mean of its divisors is an integer number (41007104).

Almost surely, 2^123021309 is an apocalyptic number.

It is an amenable number.

123021309 is a deficient number, since it is larger than the sum of its proper divisors (41007107).

123021309 is an equidigital number, since it uses as much as digits as its factorization.

123021309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41007106.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 123021309 is about 11091.4971487171. The cubic root of 123021309 is about 497.3477008290.

The spelling of 123021309 in words is "one hundred twenty-three million, twenty-one thousand, three hundred nine".