133723928 has 32 divisors (see below), whose sum is σ = 271101600. Its totient is φ = 61471488.

The previous prime is 133723927. The next prime is 133723943. The reversal of 133723928 is 829327331.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 133723891 and 133723900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133723927) 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, 24908 + ... + 29796.

It is an arithmetic number, because the mean of its divisors is an integer number (8471925).

Almost surely, 2^133723928 is an apocalyptic number.

It is an amenable number.

133723928 is an abundant number, since it is smaller than the sum of its proper divisors (137377672).

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

133723928 is a wasteful number, since it uses less digits than its factorization.

133723928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171 (or 5167 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 133723928 is about 11563.9062604295. The cubic root of 133723928 is about 511.3713292184.

The spelling of 133723928 in words is "one hundred thirty-three million, seven hundred twenty-three thousand, nine hundred twenty-eight".