71989946 has 16 divisors (see below), whose sum is σ = 124243200. Its totient is φ = 30644880.

The previous prime is 71989937. The next prime is 71989963. The reversal of 71989946 is 64998917.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15170 + ... + 19341.

It is an arithmetic number, because the mean of its divisors is an integer number (7765200).

Almost surely, 2^71989946 is an apocalyptic number.

71989946 is a deficient number, since it is larger than the sum of its proper divisors (52253254).

71989946 is a wasteful number, since it uses less digits than its factorization.

71989946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34669.

The product of its digits is 979776, while the sum is 53.

The square root of 71989946 is about 8484.6889159238. The cubic root of 71989946 is about 415.9973996694.

The spelling of 71989946 in words is "seventy-one million, nine hundred eighty-nine thousand, nine hundred forty-six".