42492209 has 4 divisors (see below), whose sum is σ = 42506100. Its totient is φ = 42478320.

The previous prime is 42492199. The next prime is 42492251. The reversal of 42492209 is 90229424.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22061809 + 20430400 = 4697^2 + 4520^2 .

It is a cyclic number.

It is not a de Polignac number, because 42492209 - 2⁴ = 42492193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42492259) 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, 122 + ... + 9219.

It is an arithmetic number, because the mean of its divisors is an integer number (10626525).

Almost surely, 2^42492209 is an apocalyptic number.

It is an amenable number.

42492209 is a deficient number, since it is larger than the sum of its proper divisors (13891).

42492209 is an equidigital number, since it uses as much as digits as its factorization.

42492209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13890.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 42492209 is about 6518.6048353923. The cubic root of 42492209 is about 348.9552765191.

The spelling of 42492209 in words is "forty-two million, four hundred ninety-two thousand, two hundred nine".