133990423 has 4 divisors (see below), whose sum is σ = 153131920. Its totient is φ = 114848928.

The previous prime is 133990397. The next prime is 133990427. The reversal of 133990423 is 324099331.

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

It is a cyclic number.

It is not a de Polignac number, because 133990423 - 2¹³ = 133982231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133990427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9570738 + ... + 9570751.

It is an arithmetic number, because the mean of its divisors is an integer number (38282980).

Almost surely, 2^133990423 is an apocalyptic number.

133990423 is a deficient number, since it is larger than the sum of its proper divisors (19141497).

133990423 is an equidigital number, since it uses as much as digits as its factorization.

133990423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19141496.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 133990423 is about 11575.4232320032. The cubic root of 133990423 is about 511.7108034278.

The spelling of 133990423 in words is "one hundred thirty-three million, nine hundred ninety thousand, four hundred twenty-three".