538138770 has 64 divisors (see below), whose sum is σ = 1403305344. Its totient is φ = 131281920.

The previous prime is 538138763. The next prime is 538138771. The reversal of 538138770 is 77831835.

It is a super-2 number, since 2×538138770² = 579186671554225800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (538138771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37965 + ... + 50175.

It is an arithmetic number, because the mean of its divisors is an integer number (21926646).

Almost surely, 2^538138770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 538138770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701652672).

538138770 is an abundant number, since it is smaller than the sum of its proper divisors (865166574).

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

538138770 is a wasteful number, since it uses less digits than its factorization.

538138770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12347.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 538138770 is about 23197.8182163754. The cubic root of 538138770 is about 813.3886236637.

The spelling of 538138770 in words is "five hundred thirty-eight million, one hundred thirty-eight thousand, seven hundred seventy".