133420440 has 64 divisors (see below), whose sum is σ = 404040960. Its totient is φ = 35242880.

The previous prime is 133420439. The next prime is 133420457. The reversal of 133420440 is 44024331.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7645 + ... + 18035.

It is an arithmetic number, because the mean of its divisors is an integer number (6313140).

Almost surely, 2^133420440 is an apocalyptic number.

133420440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202020480).

133420440 is an abundant number, since it is smaller than the sum of its proper divisors (270620520).

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

133420440 is a wasteful number, since it uses less digits than its factorization.

133420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10512 (or 10508 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 133420440 is about 11550.7765972683. The cubic root of 133420440 is about 510.9841818115.

Adding to 133420440 its reverse (44024331), we get a palindrome (177444771).

The spelling of 133420440 in words is "one hundred thirty-three million, four hundred twenty thousand, four hundred forty".