133838840 has 32 divisors (see below), whose sum is σ = 314232480. Its totient is φ = 51207552.

The previous prime is 133838839. The next prime is 133838851. The reversal of 133838840 is 48838331.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 133838794 and 133838803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71819 + ... + 73658.

It is an arithmetic number, because the mean of its divisors is an integer number (9819765).

Almost surely, 2^133838840 is an apocalyptic number.

133838840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133838840 is an abundant number, since it is smaller than the sum of its proper divisors (180393640).

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

133838840 is a wasteful number, since it uses less digits than its factorization.

133838840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145511 (or 145507 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 133838840 is about 11568.8737567665. The cubic root of 133838840 is about 511.5177649362.

The spelling of 133838840 in words is "one hundred thirty-three million, eight hundred thirty-eight thousand, eight hundred forty".