523240421 has 24 divisors (see below), whose sum is σ = 599141592. Its totient is φ = 456192000.

The previous prime is 523240391. The next prime is 523240427. The reversal of 523240421 is 124042325.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 380796196 + 142444225 = 19514^2 + 11935^2 .

It is a de Polignac number, because none of the positive numbers 2^k-523240421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523240427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326021 + ... + 327621.

It is an arithmetic number, because the mean of its divisors is an integer number (24964233).

Almost surely, 2^523240421 is an apocalyptic number.

It is an amenable number.

523240421 is a deficient number, since it is larger than the sum of its proper divisors (75901171).

523240421 is a wasteful number, since it uses less digits than its factorization.

523240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733 (or 1722 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 523240421 is about 22874.4490862622. The cubic root of 523240421 is about 805.8120586493.

Adding to 523240421 its reverse (124042325), we get a palindrome (647282746).

The spelling of 523240421 in words is "five hundred twenty-three million, two hundred forty thousand, four hundred twenty-one".