71949473 has 4 divisors (see below), whose sum is σ = 72586308. Its totient is φ = 71312640.

The previous prime is 71949467. The next prime is 71949503. The reversal of 71949473 is 37494917.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19430464 + 52519009 = 4408^2 + 7247^2 .

It is a cyclic number.

It is not a de Polignac number, because 71949473 - 2⁸ = 71949217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71949403) 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, 318248 + ... + 318473.

It is an arithmetic number, because the mean of its divisors is an integer number (18146577).

Almost surely, 2^71949473 is an apocalyptic number.

It is an amenable number.

71949473 is a deficient number, since it is larger than the sum of its proper divisors (636835).

71949473 is a wasteful number, since it uses less digits than its factorization.

71949473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636834.

The product of its digits is 190512, while the sum is 44.

The square root of 71949473 is about 8482.3035196814. The cubic root of 71949473 is about 415.9194266565.

The spelling of 71949473 in words is "seventy-one million, nine hundred forty-nine thousand, four hundred seventy-three".