505405973 has 4 divisors (see below), whose sum is σ = 505820448. Its totient is φ = 504991500.

The previous prime is 505405921. The next prime is 505405981. The reversal of 505405973 is 379504505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379504505 = 5 ⋅75900901.

It is a cyclic number.

It is not a de Polignac number, because 505405973 - 2¹⁴ = 505389589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505401973) 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, 205403 + ... + 207848.

It is an arithmetic number, because the mean of its divisors is an integer number (126455112).

Almost surely, 2^505405973 is an apocalyptic number.

It is an amenable number.

505405973 is a deficient number, since it is larger than the sum of its proper divisors (414475).

505405973 is a wasteful number, since it uses less digits than its factorization.

505405973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414474.

The product of its (nonzero) digits is 94500, while the sum is 38.

The square root of 505405973 is about 22481.2360202903. The cubic root of 505405973 is about 796.5507607464.

The spelling of 505405973 in words is "five hundred five million, four hundred five thousand, nine hundred seventy-three".