42310909 has 4 divisors (see below), whose sum is σ = 44799804. Its totient is φ = 39822016.

The previous prime is 42310901. The next prime is 42310927. The reversal of 42310909 is 90901324.

It is a happy number.

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 13527684 + 28783225 = 3678^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 42310909 - 2³ = 42310901 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 (42310901) 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, 1244422 + ... + 1244455.

It is an arithmetic number, because the mean of its divisors is an integer number (11199951).

Almost surely, 2^42310909 is an apocalyptic number.

It is an amenable number.

42310909 is a deficient number, since it is larger than the sum of its proper divisors (2488895).

42310909 is a wasteful number, since it uses less digits than its factorization.

42310909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488894.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 42310909 is about 6504.6836202847. The cubic root of 42310909 is about 348.4582773067.

The spelling of 42310909 in words is "forty-two million, three hundred ten thousand, nine hundred nine".