133923540 has 24 divisors (see below), whose sum is σ = 374986080. Its totient is φ = 35712928.

The previous prime is 133923509. The next prime is 133923541. The reversal of 133923540 is 45329331.

It is a super-2 number, since 2×133923540² = 35871029132263200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 133923498 and 133923507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133923541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1115970 + ... + 1116089.

It is an arithmetic number, because the mean of its divisors is an integer number (15624420).

Almost surely, 2^133923540 is an apocalyptic number.

133923540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133923540 is an abundant number, since it is smaller than the sum of its proper divisors (241062540).

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

133923540 is a wasteful number, since it uses less digits than its factorization.

133923540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232071 (or 2232069 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 133923540 is about 11572.5338625558. The cubic root of 133923540 is about 511.6256469690.

The spelling of 133923540 in words is "one hundred thirty-three million, nine hundred twenty-three thousand, five hundred forty".