133865860 has 24 divisors (see below), whose sum is σ = 282294936. Its totient is φ = 53322240.

The previous prime is 133865807. The next prime is 133865873. The reversal of 133865860 is 68568331.

It can be written as a sum of positive squares in 4 ways, for example, as 33385284 + 100480576 = 5778^2 + 10024^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 9067 + ... + 18706.

It is an arithmetic number, because the mean of its divisors is an integer number (11762289).

Almost surely, 2^133865860 is an apocalyptic number.

133865860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133865860 is an abundant number, since it is smaller than the sum of its proper divisors (148429076).

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

133865860 is a wasteful number, since it uses less digits than its factorization.

133865860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28023 (or 28021 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 133865860 is about 11570.0414865289. The cubic root of 133865860 is about 511.5521851390.

The spelling of 133865860 in words is "one hundred thirty-three million, eight hundred sixty-five thousand, eight hundred sixty".