473538721 has 4 divisors (see below), whose sum is σ = 475032852. Its totient is φ = 472044592.

The previous prime is 473538701. The next prime is 473538749. The reversal of 473538721 is 127835374.

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 284091025 + 189447696 = 16855^2 + 13764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-473538721 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (473538701) 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, 746590 + ... + 747223.

It is an arithmetic number, because the mean of its divisors is an integer number (118758213).

Almost surely, 2^473538721 is an apocalyptic number.

It is an amenable number.

473538721 is a deficient number, since it is larger than the sum of its proper divisors (1494131).

473538721 is a wasteful number, since it uses less digits than its factorization.

473538721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494130.

The product of its digits is 141120, while the sum is 40.

The square root of 473538721 is about 21760.9448554055. The cubic root of 473538721 is about 779.4444438679. Note that the first 5 decimals are identical.

The spelling of 473538721 in words is "four hundred seventy-three million, five hundred thirty-eight thousand, seven hundred twenty-one".