133880436 has 18 divisors (see below), whose sum is σ = 338420082. Its totient is φ = 44626800.

The previous prime is 133880407. The next prime is 133880437. The reversal of 133880436 is 634088331.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 126427536 + 7452900 = 11244^2 + 2730^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×133880436² = 35847942287100192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3718901 = 133880436 / (1 + 3 + 3 + 8 + 8 + 0 + 4 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 133880436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133880437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1859415 + ... + 1859486.

Almost surely, 2^133880436 is an apocalyptic number.

It is an amenable number.

133880436 is an abundant number, since it is smaller than the sum of its proper divisors (204539646).

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

133880436 is a wasteful number, since it uses less digits than its factorization.

133880436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718911 (or 3718906 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 133880436 is about 11570.6713720510. The cubic root of 133880436 is about 511.5707512719.

The spelling of 133880436 in words is "one hundred thirty-three million, eight hundred eighty thousand, four hundred thirty-six".