42009069 has 4 divisors (see below), whose sum is σ = 56012096. Its totient is φ = 28006044.

The previous prime is 42009059. The next prime is 42009083. The reversal of 42009069 is 96090024.

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 42009069 - 2²⁵ = 8454637 is a prime.

It is a super-2 number, since 2×42009069² = 3529523756493522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42009029) 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, 7001509 + ... + 7001514.

It is an arithmetic number, because the mean of its divisors is an integer number (14003024).

Almost surely, 2^42009069 is an apocalyptic number.

It is an amenable number.

42009069 is a deficient number, since it is larger than the sum of its proper divisors (14003027).

42009069 is a wasteful number, since it uses less digits than its factorization.

42009069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14003026.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 42009069 is about 6481.4403491817. The cubic root of 42009069 is about 347.6276818037.

The spelling of 42009069 in words is "forty-two million, nine thousand, sixty-nine".