133994638 has 4 divisors (see below), whose sum is σ = 200991960. Its totient is φ = 66997318.

The previous prime is 133994611. The next prime is 133994671. The reversal of 133994638 is 836499331.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33498658 + ... + 33498661.

It is an arithmetic number, because the mean of its divisors is an integer number (50247990).

Almost surely, 2^133994638 is an apocalyptic number.

133994638 is a deficient number, since it is larger than the sum of its proper divisors (66997322).

133994638 is an equidigital number, since it uses as much as digits as its factorization.

133994638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66997321.

The product of its digits is 419904, while the sum is 46.

The square root of 133994638 is about 11575.6052973484. The cubic root of 133994638 is about 511.7161690810.

The spelling of 133994638 in words is "one hundred thirty-three million, nine hundred ninety-four thousand, six hundred thirty-eight".