133431240 has 64 divisors (see below), whose sum is σ = 401319360. Its totient is φ = 35490560.

The previous prime is 133431239. The next prime is 133431271. The reversal of 133431240 is 42134331.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54850 + ... + 57230.

It is an arithmetic number, because the mean of its divisors is an integer number (6270615).

Almost surely, 2^133431240 is an apocalyptic number.

133431240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133431240 is an abundant number, since it is smaller than the sum of its proper divisors (267888120).

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

133431240 is a wasteful number, since it uses less digits than its factorization.

133431240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 133431240 is about 11551.2440888417. The cubic root of 133431240 is about 510.9979690050.

Adding to 133431240 its reverse (42134331), we get a palindrome (175565571).

The spelling of 133431240 in words is "one hundred thirty-three million, four hundred thirty-one thousand, two hundred forty".