71939388 has 12 divisors (see below), whose sum is σ = 167858600. Its totient is φ = 23979792.

The previous prime is 71939381. The next prime is 71939407. The reversal of 71939388 is 88393917.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71939381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2997463 + ... + 2997486.

Almost surely, 2^71939388 is an apocalyptic number.

It is an amenable number.

71939388 is an abundant number, since it is smaller than the sum of its proper divisors (95919212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71939388 is a wasteful number, since it uses less digits than its factorization.

71939388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5994956 (or 5994954 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 71939388 is about 8481.7090258980. The cubic root of 71939388 is about 415.8999929103.

It can be divided in two parts, 71939 and 388, that added together give a palindrome (72327).

The spelling of 71939388 in words is "seventy-one million, nine hundred thirty-nine thousand, three hundred eighty-eight".