538661388 has 24 divisors (see below), whose sum is σ = 1330810992. Its totient is φ = 168991744.

The previous prime is 538661369. The next prime is 538661393. The reversal of 538661388 is 883166835.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1320045 + ... + 1320452.

It is an arithmetic number, because the mean of its divisors is an integer number (55450458).

Almost surely, 2^538661388 is an apocalyptic number.

It is an amenable number.

538661388 is an abundant number, since it is smaller than the sum of its proper divisors (792149604).

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

538661388 is a wasteful number, since it uses less digits than its factorization.

538661388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640521 (or 2640519 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 538661388 is about 23209.0798611233. The cubic root of 538661388 is about 813.6518482093.

The spelling of 538661388 in words is "five hundred thirty-eight million, six hundred sixty-one thousand, three hundred eighty-eight".