133881646 has 8 divisors (see below), whose sum is σ = 205720704. Its totient is φ = 65308080.

The previous prime is 133881637. The next prime is 133881659. The reversal of 133881646 is 646188331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 133881599 and 133881608.

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, 816270 + ... + 816433.

It is an arithmetic number, because the mean of its divisors is an integer number (25715088).

Almost surely, 2^133881646 is an apocalyptic number.

133881646 is a deficient number, since it is larger than the sum of its proper divisors (71839058).

133881646 is a wasteful number, since it uses less digits than its factorization.

133881646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632746.

The product of its digits is 82944, while the sum is 40.

The square root of 133881646 is about 11570.7236593050. The cubic root of 133881646 is about 511.5722924449.

The spelling of 133881646 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, six hundred forty-six".