42243309 has 16 divisors (see below), whose sum is σ = 62776000. Its totient is φ = 28075248.

The previous prime is 42243281. The next prime is 42243337. The reversal of 42243309 is 90334224.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42243281) and next prime (42243337).

It is not a de Polignac number, because 42243309 - 2²⁰ = 41194733 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42243349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7182 + ... + 11664.

It is an arithmetic number, because the mean of its divisors is an integer number (3923500).

Almost surely, 2^42243309 is an apocalyptic number.

It is an amenable number.

42243309 is a deficient number, since it is larger than the sum of its proper divisors (20532691).

42243309 is a wasteful number, since it uses less digits than its factorization.

42243309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841 (or 4835 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 42243309 is about 6499.4852873131. The cubic root of 42243309 is about 348.2726015063.

The spelling of 42243309 in words is "forty-two million, two hundred forty-three thousand, three hundred nine".