42437509 has 4 divisors (see below), whose sum is σ = 42452640. Its totient is φ = 42422380.

The previous prime is 42437503. The next prime is 42437513. The reversal of 42437509 is 90573424.

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 a cyclic number.

It is not a de Polignac number, because 42437509 - 2⁹ = 42436997 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 (42437503) 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, 1987 + ... + 9424.

It is an arithmetic number, because the mean of its divisors is an integer number (10613160).

Almost surely, 2^42437509 is an apocalyptic number.

It is an amenable number.

42437509 is a deficient number, since it is larger than the sum of its proper divisors (15131).

42437509 is a wasteful number, since it uses less digits than its factorization.

42437509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15130.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 42437509 is about 6514.4078011743. The cubic root of 42437509 is about 348.8054761164.

The spelling of 42437509 in words is "forty-two million, four hundred thirty-seven thousand, five hundred nine".