506431989 has 24 divisors (see below), whose sum is σ = 885193920. Its totient is φ = 272366208.

The previous prime is 506431979. The next prime is 506431999. The reversal of 506431989 is 989134605.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (506431979) and next prime (506431999).

It is not a de Polignac number, because 506431989 - 2⁴ = 506431973 is a prime.

It is a super-2 number, since 2×506431989² = 512946718964992242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506431979) 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, 235359 + ... + 237500.

It is an arithmetic number, because the mean of its divisors is an integer number (36883080).

Almost surely, 2^506431989 is an apocalyptic number.

It is an amenable number.

506431989 is a deficient number, since it is larger than the sum of its proper divisors (378761931).

506431989 is a wasteful number, since it uses less digits than its factorization.

506431989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472889 (or 472886 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 506431989 is about 22504.0438366086. The cubic root of 506431989 is about 797.0894177517.

The spelling of 506431989 in words is "five hundred six million, four hundred thirty-one thousand, nine hundred eighty-nine".