1538869266 has 80 divisors (see below), whose sum is σ = 3818121120. Its totient is φ = 459328320.

The previous prime is 1538869231. The next prime is 1538869279. The reversal of 1538869266 is 6629688351.

It is a happy number.

1538869266 is a `hidden beast` number, since 1 + 538 + 86 + 9 + 26 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 112950 + ... + 125838.

It is an arithmetic number, because the mean of its divisors is an integer number (47726514).

Almost surely, 2^1538869266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538869266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909060560).

1538869266 is an abundant number, since it is smaller than the sum of its proper divisors (2279251854).

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

1538869266 is a wasteful number, since it uses less digits than its factorization.

1538869266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981 (or 12972 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 1538869266 is about 39228.4242100036. The cubic root of 1538869266 is about 1154.5176464530.

It can be divided in two parts, 1538869 and 266, that added together give a triangular number (1539135 = T₁₇₅₄).

The spelling of 1538869266 in words is "one billion, five hundred thirty-eight million, eight hundred sixty-nine thousand, two hundred sixty-six".