133440413 has 4 divisors (see below), whose sum is σ = 133465980. Its totient is φ = 133414848.

The previous prime is 133440407. The next prime is 133440467. The reversal of 133440413 is 314044331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 314044331 = 19 ⋅16528649.

It can be written as a sum of positive squares in 2 ways, for example, as 49589764 + 83850649 = 7042^2 + 9157^2 .

It is a cyclic number.

It is not a de Polignac number, because 133440413 - 2²⁶ = 66331549 is a prime.

It is a super-2 number, since 2×133440413² = 35612687643221138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133445413) 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, 1820 + ... + 16437.

It is an arithmetic number, because the mean of its divisors is an integer number (33366495).

Almost surely, 2^133440413 is an apocalyptic number.

It is an amenable number.

133440413 is a deficient number, since it is larger than the sum of its proper divisors (25567).

133440413 is an equidigital number, since it uses as much as digits as its factorization.

133440413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25566.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 133440413 is about 11551.6411388166. The cubic root of 133440413 is about 511.0096785991.

Adding to 133440413 its reverse (314044331), we get a palindrome (447484744).

The spelling of 133440413 in words is "one hundred thirty-three million, four hundred forty thousand, four hundred thirteen".