133985440 has 24 divisors (see below), whose sum is σ = 316540980. Its totient is φ = 53594112.

The previous prime is 133985437. The next prime is 133985443. The reversal of 133985440 is 44589331.

It is an interprime number because it is at equal distance from previous prime (133985437) and next prime (133985443).

It can be written as a sum of positive squares in 2 ways, for example, as 123565456 + 10419984 = 11116^2 + 3228^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 133985440.

It is not an unprimeable number, because it can be changed into a prime (133985443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418545 + ... + 418864.

Almost surely, 2^133985440 is an apocalyptic number.

133985440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133985440 is an abundant number, since it is smaller than the sum of its proper divisors (182555540).

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

133985440 is an equidigital number, since it uses as much as digits as its factorization.

133985440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837424 (or 837416 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 133985440 is about 11575.2079894920. The cubic root of 133985440 is about 511.7044599731.

The spelling of 133985440 in words is "one hundred thirty-three million, nine hundred eighty-five thousand, four hundred forty".