538401816 has 80 divisors (see below), whose sum is σ = 1530654840. Its totient is φ = 176774400.

The previous prime is 538401797. The next prime is 538401817. The reversal of 538401816 is 618104835.

538401816 is a `hidden beast` number, since 538 + 40 + 1 + 81 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538401817) 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 19 ways as a sum of consecutive naturals, for example, 37216 + ... + 49616.

Almost surely, 2^538401816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 538401816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765327420).

538401816 is an abundant number, since it is smaller than the sum of its proper divisors (992253024).

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

538401816 is a wasteful number, since it uses less digits than its factorization.

538401816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12486 (or 12473 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 538401816 is about 23203.4871517192. The cubic root of 538401816 is about 813.5211320945.

The spelling of 538401816 in words is "five hundred thirty-eight million, four hundred one thousand, eight hundred sixteen".