133723440 has 80 divisors (see below), whose sum is σ = 460610400. Its totient is φ = 35659008.

The previous prime is 133723393. The next prime is 133723451. The reversal of 133723440 is 44327331.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 28795 + ... + 33114.

It is an arithmetic number, because the mean of its divisors is an integer number (5757630).

Almost surely, 2^133723440 is an apocalyptic number.

133723440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133723440 is an abundant number, since it is smaller than the sum of its proper divisors (326886960).

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

133723440 is a wasteful number, since it uses less digits than its factorization.

133723440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61931 (or 61919 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 133723440 is about 11563.8851602738. The cubic root of 133723440 is about 511.3707071669.

The spelling of 133723440 in words is "one hundred thirty-three million, seven hundred twenty-three thousand, four hundred forty".