42732309 has 4 divisors (see below), whose sum is σ = 56976416. Its totient is φ = 28488204.

The previous prime is 42732307. The next prime is 42732329. The reversal of 42732309 is 90323724.

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 42732309 - 2¹ = 42732307 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 (42732307) 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, 7122049 + ... + 7122054.

It is an arithmetic number, because the mean of its divisors is an integer number (14244104).

Almost surely, 2^42732309 is an apocalyptic number.

It is an amenable number.

42732309 is a deficient number, since it is larger than the sum of its proper divisors (14244107).

42732309 is a wasteful number, since it uses less digits than its factorization.

42732309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14244106.

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

The square root of 42732309 is about 6536.9954107373. The cubic root of 42732309 is about 349.6112936366.

The spelling of 42732309 in words is "forty-two million, seven hundred thirty-two thousand, three hundred nine".