133691376 has 160 divisors (see below), whose sum is σ = 430194688. Its totient is φ = 34836480.

The previous prime is 133691339. The next prime is 133691381. The reversal of 133691376 is 673196331.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 554616 + ... + 554856.

Almost surely, 2^133691376 is an apocalyptic number.

133691376 is a gapful number since it is divisible by the number (16) 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 133691376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215097344).

133691376 is an abundant number, since it is smaller than the sum of its proper divisors (296503312).

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

133691376 is a wasteful number, since it uses less digits than its factorization.

133691376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 393 counting only the distinct ones).

The product of its digits is 61236, while the sum is 39.

The square root of 133691376 is about 11562.4986918918. The cubic root of 133691376 is about 511.3298320068.

The spelling of 133691376 in words is "one hundred thirty-three million, six hundred ninety-one thousand, three hundred seventy-six".