133440423 has 16 divisors (see below), whose sum is σ = 181553376. Its totient is φ = 87160320.

The previous prime is 133440407. The next prime is 133440467. The reversal of 133440423 is 324044331.

It is not a de Polignac number, because 133440423 - 2⁴ = 133440407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133440393 and 133440402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133440023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32443 + ... + 36323.

It is an arithmetic number, because the mean of its divisors is an integer number (11347086).

Almost surely, 2^133440423 is an apocalyptic number.

133440423 is a deficient number, since it is larger than the sum of its proper divisors (48112953).

133440423 is a wasteful number, since it uses less digits than its factorization.

133440423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114.

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 133440423 is about 11551.6415716555. The cubic root of 133440423 is about 511.0096913640.

Adding to 133440423 its reverse (324044331), we get a palindrome (457484754).

The spelling of 133440423 in words is "one hundred thirty-three million, four hundred forty thousand, four hundred twenty-three".