505440357 has 4 divisors (see below), whose sum is σ = 673920480. Its totient is φ = 336960236.

The previous prime is 505440347. The next prime is 505440367. The reversal of 505440357 is 753044505.

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.

It is an interprime number because it is at equal distance from previous prime (505440347) and next prime (505440367).

It is a cyclic number.

It is not a de Polignac number, because 505440357 - 2¹⁴ = 505423973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505440317) 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, 84240057 + ... + 84240062.

It is an arithmetic number, because the mean of its divisors is an integer number (168480120).

Almost surely, 2^505440357 is an apocalyptic number.

It is an amenable number.

505440357 is a deficient number, since it is larger than the sum of its proper divisors (168480123).

505440357 is a wasteful number, since it uses less digits than its factorization.

505440357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168480122.

The product of its (nonzero) digits is 42000, while the sum is 33.

The square root of 505440357 is about 22482.0007339205. Note that the first 3 decimals coincide. The cubic root of 505440357 is about 796.5688240999.

Subtracting from 505440357 its sum of digits (33), we obtain a square (505440324 = 22482²).

The spelling of 505440357 in words is "five hundred five million, four hundred forty thousand, three hundred fifty-seven".