42042209 has 8 divisors (see below), whose sum is σ = 46057440. Its totient is φ = 38059200.

The previous prime is 42042191. The next prime is 42042211. The reversal of 42042209 is 90224024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42042209 - 2²⁰ = 40993633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42042109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5279 + ... + 10580.

It is an arithmetic number, because the mean of its divisors is an integer number (5757180).

Almost surely, 2^42042209 is an apocalyptic number.

It is an amenable number.

42042209 is a deficient number, since it is larger than the sum of its proper divisors (4015231).

42042209 is a wasteful number, since it uses less digits than its factorization.

42042209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16111.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 42042209 is about 6483.9963756930. The cubic root of 42042209 is about 347.7190696364.

The spelling of 42042209 in words is "forty-two million, forty-two thousand, two hundred nine".