133253240 has 16 divisors (see below), whose sum is σ = 299819880. Its totient is φ = 53301280.

The previous prime is 133253227. The next prime is 133253257. The reversal of 133253240 is 42352331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665626 + ... + 1665705.

Almost surely, 2^133253240 is an apocalyptic number.

133253240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133253240 is an abundant number, since it is smaller than the sum of its proper divisors (166566640).

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

133253240 is a wasteful number, since it uses less digits than its factorization.

133253240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331342 (or 3331338 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 133253240 is about 11543.5367197406. The cubic root of 133253240 is about 510.7706406449.

Subtracting from 133253240 its reverse (42352331), we obtain a palindrome (90900909).

The spelling of 133253240 in words is "one hundred thirty-three million, two hundred fifty-three thousand, two hundred forty".