505421424 has 80 divisors (see below), whose sum is σ = 1536107040. Its totient is φ = 158561280.

The previous prime is 505421393. The next prime is 505421429. The reversal of 505421424 is 424124505.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505421429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27067 + ... + 41754.

It is an arithmetic number, because the mean of its divisors is an integer number (19201338).

Almost surely, 2^505421424 is an apocalyptic number.

505421424 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

505421424 is an abundant number, since it is smaller than the sum of its proper divisors (1030685616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505421424 is a wasteful number, since it uses less digits than its factorization.

505421424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68855 (or 68843 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 505421424 is about 22481.5796598015. The cubic root of 505421424 is about 796.5588779044.

Adding to 505421424 its reverse (424124505), we get a palindrome (929545929).

The spelling of 505421424 in words is "five hundred five million, four hundred twenty-one thousand, four hundred twenty-four".