133855840 has 48 divisors (see below), whose sum is σ = 316930320. Its totient is φ = 53424640.

The previous prime is 133855831. The next prime is 133855849. The reversal of 133855840 is 48558331.

It is an interprime number because it is at equal distance from previous prime (133855831) and next prime (133855849).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 133855840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133855849) 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, 130851 + ... + 131869.

It is an arithmetic number, because the mean of its divisors is an integer number (6602715).

Almost surely, 2^133855840 is an apocalyptic number.

133855840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133855840 is an abundant number, since it is smaller than the sum of its proper divisors (183074480).

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

133855840 is a wasteful number, since it uses less digits than its factorization.

133855840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855 (or 1847 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 133855840 is about 11569.6084635566. The cubic root of 133855840 is about 511.5394214147.

The spelling of 133855840 in words is "one hundred thirty-three million, eight hundred fifty-five thousand, eight hundred forty".