505792721 has 8 divisors (see below), whose sum is σ = 612051840. Its totient is φ = 408034368.

The previous prime is 505792669. The next prime is 505792751. The reversal of 505792721 is 127297505.

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

It is not a de Polignac number, because 505792721 - 2⁶ = 505792657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505792751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2125061 + ... + 2125298.

It is an arithmetic number, because the mean of its divisors is an integer number (76506480).

Almost surely, 2^505792721 is an apocalyptic number.

It is an amenable number.

505792721 is a deficient number, since it is larger than the sum of its proper divisors (106259119).

505792721 is a wasteful number, since it uses less digits than its factorization.

505792721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250383.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 505792721 is about 22489.8359487125. The cubic root of 505792721 is about 796.7538884524.

The spelling of 505792721 in words is "five hundred five million, seven hundred ninety-two thousand, seven hundred twenty-one".