520693940 has 24 divisors (see below), whose sum is σ = 1177569960. Its totient is φ = 192256128.

The previous prime is 520693931. The next prime is 520693951. The reversal of 520693940 is 49396025.

It can be written as a sum of positive squares in 4 ways, for example, as 61277584 + 459416356 = 7828^2 + 21434^2 .

It is a super-2 number, since 2×520693940² = 542244358305447200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 520693894 and 520693903.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001075 + ... + 1001594.

It is an arithmetic number, because the mean of its divisors is an integer number (49065415).

Almost surely, 2^520693940 is an apocalyptic number.

It is an amenable number.

520693940 is an abundant number, since it is smaller than the sum of its proper divisors (656876020).

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

520693940 is a wasteful number, since it uses less digits than its factorization.

520693940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002691 (or 2002689 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 520693940 is about 22818.7190700968. The cubic root of 520693940 is about 804.5027032824.

The spelling of 520693940 in words is "five hundred twenty million, six hundred ninety-three thousand, nine hundred forty".