133981040 has 20 divisors (see below), whose sum is σ = 311506104. Its totient is φ = 53592384.

The previous prime is 133981031. The next prime is 133981093. The reversal of 133981040 is 40189331.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 133980994 and 133981012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837302 + ... + 837461.

Almost surely, 2^133981040 is an apocalyptic number.

133981040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133981040 is an abundant number, since it is smaller than the sum of its proper divisors (177525064).

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

133981040 is a wasteful number, since it uses less digits than its factorization.

133981040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674776 (or 1674770 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 133981040 is about 11575.0179265520. The cubic root of 133981040 is about 511.6988585578.

The spelling of 133981040 in words is "one hundred thirty-three million, nine hundred eighty-one thousand, forty".