538396640 has 24 divisors (see below), whose sum is σ = 1271962440. Its totient is φ = 215358592.

The previous prime is 538396601. The next prime is 538396643. The reversal of 538396640 is 46693835.

It is a junction number, because it is equal to n+sod(n) for n = 538396591 and 538396600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538396643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1682330 + ... + 1682649.

It is an arithmetic number, because the mean of its divisors is an integer number (52998435).

Almost surely, 2^538396640 is an apocalyptic number.

It is an amenable number.

538396640 is an abundant number, since it is smaller than the sum of its proper divisors (733565800).

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

538396640 is a wasteful number, since it uses less digits than its factorization.

538396640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364994 (or 3364986 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 538396640 is about 23203.3756164917. The cubic root of 538396640 is about 813.5185251203.

The spelling of 538396640 in words is "five hundred thirty-eight million, three hundred ninety-six thousand, six hundred forty".