133889380 has 12 divisors (see below), whose sum is σ = 281167740. Its totient is φ = 53555744.

The previous prime is 133889363. The next prime is 133889381. The reversal of 133889380 is 83988331.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45265984 + 88623396 = 6728^2 + 9414^2 .

It is not an unprimeable number, because it can be changed into a prime (133889381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3347215 + ... + 3347254.

It is an arithmetic number, because the mean of its divisors is an integer number (23430645).

Almost surely, 2^133889380 is an apocalyptic number.

133889380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133889380 is an abundant number, since it is smaller than the sum of its proper divisors (147278360).

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

133889380 is a wasteful number, since it uses less digits than its factorization.

133889380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6694478 (or 6694476 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 133889380 is about 11571.0578600230. The cubic root of 133889380 is about 511.5821429958.

The spelling of 133889380 in words is "one hundred thirty-three million, eight hundred eighty-nine thousand, three hundred eighty".