71442539 has 6 divisors (see below), whose sum is σ = 83106684. Its totient is φ = 61236420.

The previous prime is 71442533. The next prime is 71442583. The reversal of 71442539 is 93524417.

It is not a de Polignac number, because 71442539 - 2²⁴ = 54665323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71442499 and 71442508.

It is not an unprimeable number, because it can be changed into a prime (71442533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 728957 + ... + 729054.

It is an arithmetic number, because the mean of its divisors is an integer number (13851114).

Almost surely, 2^71442539 is an apocalyptic number.

71442539 is a deficient number, since it is larger than the sum of its proper divisors (11664145).

71442539 is a wasteful number, since it uses less digits than its factorization.

71442539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458025 (or 1458018 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 71442539 is about 8452.3688395621. The cubic root of 71442539 is about 414.9403097970.

The spelling of 71442539 in words is "seventy-one million, four hundred forty-two thousand, five hundred thirty-nine".