42404509 has 4 divisors (see below), whose sum is σ = 48462304. Its totient is φ = 36346716.

The previous prime is 42404507. The next prime is 42404513. The reversal of 42404509 is 90540424.

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 42404509 - 2¹ = 42404507 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 (42404503) 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, 3028887 + ... + 3028900.

It is an arithmetic number, because the mean of its divisors is an integer number (12115576).

Almost surely, 2^42404509 is an apocalyptic number.

It is an amenable number.

42404509 is a deficient number, since it is larger than the sum of its proper divisors (6057795).

42404509 is an equidigital number, since it uses as much as digits as its factorization.

42404509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6057794.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 42404509 is about 6511.8744613206. The cubic root of 42404509 is about 348.7150406670.

The spelling of 42404509 in words is "forty-two million, four hundred four thousand, five hundred nine".