71439427 has 4 divisors (see below), whose sum is σ = 71867376. Its totient is φ = 71011480.

The previous prime is 71439413. The next prime is 71439439. The reversal of 71439427 is 72493417.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71439427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71439227) 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, 213724 + ... + 214057.

It is an arithmetic number, because the mean of its divisors is an integer number (17966844).

Almost surely, 2^71439427 is an apocalyptic number.

71439427 is a deficient number, since it is larger than the sum of its proper divisors (427949).

71439427 is a wasteful number, since it uses less digits than its factorization.

71439427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427948.

The product of its digits is 42336, while the sum is 37.

The square root of 71439427 is about 8452.1847471527. The cubic root of 71439427 is about 414.9342848479.

The spelling of 71439427 in words is "seventy-one million, four hundred thirty-nine thousand, four hundred twenty-seven".