113438405 has 4 divisors (see below), whose sum is σ = 136126092. Its totient is φ = 90750720.

The previous prime is 113438387. The next prime is 113438407. The reversal of 113438405 is 504834311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504834311 = 613 ⋅823547.

It can be written as a sum of positive squares in 2 ways, for example, as 65302561 + 48135844 = 8081^2 + 6938^2 .

It is not a de Polignac number, because 113438405 - 2¹⁰ = 113437381 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 (113438407) 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, 11343836 + ... + 11343845.

It is an arithmetic number, because the mean of its divisors is an integer number (34031523).

Almost surely, 2^113438405 is an apocalyptic number.

It is an amenable number.

113438405 is a deficient number, since it is larger than the sum of its proper divisors (22687687).

113438405 is an equidigital number, since it uses as much as digits as its factorization.

113438405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22687686.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 113438405 is about 10650.7466874393. The cubic root of 113438405 is about 484.0832293747.

The spelling of 113438405 in words is "one hundred thirteen million, four hundred thirty-eight thousand, four hundred five".