133181940 has 48 divisors (see below), whose sum is σ = 382011840. Its totient is φ = 34648320.

The previous prime is 133181911. The next prime is 133181941. The reversal of 133181940 is 49181331.

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 = 133181898 and 133181907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133181941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24610 + ... + 29529.

It is an arithmetic number, because the mean of its divisors is an integer number (7958580).

Almost surely, 2^133181940 is an apocalyptic number.

133181940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133181940 is an abundant number, since it is smaller than the sum of its proper divisors (248829900).

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

133181940 is a wasteful number, since it uses less digits than its factorization.

133181940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54192 (or 54190 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 133181940 is about 11540.4479982365. The cubic root of 133181940 is about 510.6795248016.

The spelling of 133181940 in words is "one hundred thirty-three million, one hundred eighty-one thousand, nine hundred forty".