42539291 has 4 divisors (see below), whose sum is σ = 42600000. Its totient is φ = 42478584.

The previous prime is 42539279. The next prime is 42539293. The reversal of 42539291 is 19293524.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42539291 - 2⁶ = 42539227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42539293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29291 + ... + 30708.

It is an arithmetic number, because the mean of its divisors is an integer number (10650000).

Almost surely, 2^42539291 is an apocalyptic number.

42539291 is a deficient number, since it is larger than the sum of its proper divisors (60709).

42539291 is an equidigital number, since it uses as much as digits as its factorization.

42539291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60708.

The product of its digits is 19440, while the sum is 35.

The square root of 42539291 is about 6522.2151911755. The cubic root of 42539291 is about 349.0841114937.

The spelling of 42539291 in words is "forty-two million, five hundred thirty-nine thousand, two hundred ninety-one".