133991444 has 24 divisors (see below), whose sum is σ = 241136448. Its totient is φ = 65108160.

The previous prime is 133991443. The next prime is 133991447. The reversal of 133991444 is 444199331.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 133991398 and 133991407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133991443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44969 + ... + 47855.

It is an arithmetic number, because the mean of its divisors is an integer number (10047352).

Almost surely, 2^133991444 is an apocalyptic number.

It is an amenable number.

133991444 is a deficient number, since it is larger than the sum of its proper divisors (107145004).

133991444 is a wasteful number, since it uses less digits than its factorization.

133991444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215 (or 3213 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 133991444 is about 11575.4673339784. The cubic root of 133991444 is about 511.7121031610.

The spelling of 133991444 in words is "one hundred thirty-three million, nine hundred ninety-one thousand, four hundred forty-four".