133621940 has 24 divisors (see below), whose sum is σ = 286578432. Its totient is φ = 52311200.

The previous prime is 133621931. The next prime is 133621967. The reversal of 133621940 is 49126331.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70136 + ... + 72015.

It is an arithmetic number, because the mean of its divisors is an integer number (11940768).

Almost surely, 2^133621940 is an apocalyptic number.

133621940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133621940 is an abundant number, since it is smaller than the sum of its proper divisors (152956492).

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

133621940 is a wasteful number, since it uses less digits than its factorization.

133621940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142207 (or 142205 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 133621940 is about 11559.4956637390. The cubic root of 133621940 is about 511.2412926465.

The spelling of 133621940 in words is "one hundred thirty-three million, six hundred twenty-one thousand, nine hundred forty".