133639740 has 96 divisors (see below), whose sum is σ = 447773760. Its totient is φ = 32894208.

The previous prime is 133639733. The next prime is 133639757. The reversal of 133639740 is 47936331.

133639740 is a `hidden beast` number, since 13 + 3 + 639 + 7 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 133639695 and 133639704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2499 + ... + 16538.

It is an arithmetic number, because the mean of its divisors is an integer number (4664310).

Almost surely, 2^133639740 is an apocalyptic number.

133639740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133639740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223886880).

133639740 is an abundant number, since it is smaller than the sum of its proper divisors (314134020).

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

133639740 is a wasteful number, since it uses less digits than its factorization.

133639740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19068 (or 19060 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The square root of 133639740 is about 11560.2655678838. The cubic root of 133639740 is about 511.2639927384.

The spelling of 133639740 in words is "one hundred thirty-three million, six hundred thirty-nine thousand, seven hundred forty".