71389387 has 4 divisors (see below), whose sum is σ = 73851120. Its totient is φ = 68927656.

The previous prime is 71389369. The next prime is 71389393. The reversal of 71389387 is 78398317.

It is a happy number.

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 71389387 - 2²³ = 63000779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71389397) 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, 1230823 + ... + 1230880.

It is an arithmetic number, because the mean of its divisors is an integer number (18462780).

Almost surely, 2^71389387 is an apocalyptic number.

71389387 is a deficient number, since it is larger than the sum of its proper divisors (2461733).

71389387 is a wasteful number, since it uses less digits than its factorization.

71389387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461732.

The product of its digits is 254016, while the sum is 46.

The square root of 71389387 is about 8449.2240472129. The cubic root of 71389387 is about 414.8373814885.

It can be divided in two parts, 713 and 89387, that added together give a triangular number (90100 = T₄₂₄).

The spelling of 71389387 in words is "seventy-one million, three hundred eighty-nine thousand, three hundred eighty-seven".