133899444 has 36 divisors (see below), whose sum is σ = 386821344. Its totient is φ = 38256912.

The previous prime is 133899443. The next prime is 133899449. The reversal of 133899444 is 444998331.

It is a happy number.

133899444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×133899444² = 35858122207018272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133899444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133899443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265422 + ... + 265925.

Almost surely, 2^133899444 is an apocalyptic number.

133899444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

133899444 is an abundant number, since it is smaller than the sum of its proper divisors (252921900).

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

133899444 is a wasteful number, since it uses less digits than its factorization.

133899444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531364 (or 531359 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 133899444 is about 11571.4927299809. The cubic root of 133899444 is about 511.5949606260.

The spelling of 133899444 in words is "one hundred thirty-three million, eight hundred ninety-nine thousand, four hundred forty-four".