71399906 has 8 divisors (see below), whose sum is σ = 107819100. Its totient is φ = 35460208.

The previous prime is 71399903. The next prime is 71399921. The reversal of 71399906 is 60999317.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55726225 + 15673681 = 7465^2 + 3959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (71399903) 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, 119501 + ... + 120096.

Almost surely, 2^71399906 is an apocalyptic number.

71399906 is a deficient number, since it is larger than the sum of its proper divisors (36419194).

71399906 is a wasteful number, since it uses less digits than its factorization.

71399906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239748.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 71399906 is about 8449.8465074817. The cubic root of 71399906 is about 414.8577554791.

The spelling of 71399906 in words is "seventy-one million, three hundred ninety-nine thousand, nine hundred six".