133423540 has 24 divisors (see below), whose sum is σ = 282076200. Its totient is φ = 53010048.

The previous prime is 133423513. The next prime is 133423541. The reversal of 133423540 is 45324331.

It can be written as a sum of positive squares in 4 ways, for example, as 4963984 + 128459556 = 2228^2 + 11334^2 .

It is a super-2 number, since 2×133423540² = 35603682052263200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133423541) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 19407 + ... + 25366.

It is an arithmetic number, because the mean of its divisors is an integer number (11753175).

Almost surely, 2^133423540 is an apocalyptic number.

133423540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133423540 is an abundant number, since it is smaller than the sum of its proper divisors (148652660).

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

133423540 is a wasteful number, since it uses less digits than its factorization.

133423540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44931 (or 44929 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 133423540 is about 11550.9107866003. The cubic root of 133423540 is about 510.9881393228.

Adding to 133423540 its reverse (45324331), we get a palindrome (178747871).

The spelling of 133423540 in words is "one hundred thirty-three million, four hundred twenty-three thousand, five hundred forty".