42723309 has 4 divisors (see below), whose sum is σ = 56964416. Its totient is φ = 28482204.

The previous prime is 42723299. The next prime is 42723319. The reversal of 42723309 is 90332724.

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 an interprime number because it is at equal distance from previous prime (42723299) and next prime (42723319).

It is not a de Polignac number, because 42723309 - 2⁵ = 42723277 is a prime.

It is a super-2 number, since 2×42723309² = 3650562263818962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42723319) 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 3 ways as a sum of consecutive naturals, for example, 7120549 + ... + 7120554.

It is an arithmetic number, because the mean of its divisors is an integer number (14241104).

Almost surely, 2^42723309 is an apocalyptic number.

It is an amenable number.

42723309 is a deficient number, since it is larger than the sum of its proper divisors (14241107).

42723309 is a wasteful number, since it uses less digits than its factorization.

42723309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14241106.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 42723309 is about 6536.3069848348. The cubic root of 42723309 is about 349.5867476304.

The spelling of 42723309 in words is "forty-two million, seven hundred twenty-three thousand, three hundred nine".