1538538828 has 48 divisors (see below), whose sum is σ = 3863440224. Its totient is φ = 474762240.

The previous prime is 1538538823. The next prime is 1538538829. The reversal of 1538538828 is 8288358351.

It is a happy number.

It is a super-2 number, since 2×1538538828² = 4734203450527227168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1538538823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49375 + ... + 74262.

It is an arithmetic number, because the mean of its divisors is an integer number (80488338).

Almost surely, 2^1538538828 is an apocalyptic number.

It is an amenable number.

1538538828 is an abundant number, since it is smaller than the sum of its proper divisors (2324901396).

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

1538538828 is a wasteful number, since it uses less digits than its factorization.

1538538828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123722 (or 123720 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 51.

The square root of 1538538828 is about 39224.2122674248. The cubic root of 1538538828 is about 1154.4350048624.

The spelling of 1538538828 in words is "one billion, five hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred twenty-eight".