5231640 has 32 divisors (see below), whose sum is σ = 15695280. Its totient is φ = 1395072.

The previous prime is 5231623. The next prime is 5231647. The reversal of 5231640 is 461325.

It is a happy number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5231647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21679 + ... + 21918.

Almost surely, 2^5231640 is an apocalyptic number.

It is an amenable number.

5231640 is an abundant number, since it is smaller than the sum of its proper divisors (10463640).

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

5231640 is a wasteful number, since it uses less digits than its factorization.

5231640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43611 (or 43607 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 5231640 is about 2287.2778580662. The cubic root of 5231640 is about 173.5984929117.

Adding to 5231640 its reverse (461325), we get a palindrome (5692965).

The spelling of 5231640 in words is "five million, two hundred thirty-one thousand, six hundred forty".