244021405 has 4 divisors (see below), whose sum is σ = 292825692. Its totient is φ = 195217120.

The previous prime is 244021397. The next prime is 244021439. The reversal of 244021405 is 504120442.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 69939769 + 174081636 = 8363^2 + 13194^2 .

It is not a de Polignac number, because 244021405 - 2³ = 244021397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24402136 + ... + 24402145.

It is an arithmetic number, because the mean of its divisors is an integer number (73206423).

Almost surely, 2^244021405 is an apocalyptic number.

It is an amenable number.

244021405 is a deficient number, since it is larger than the sum of its proper divisors (48804287).

244021405 is an equidigital number, since it uses as much as digits as its factorization.

244021405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48804286.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 244021405 is about 15621.1844941413. The cubic root of 244021405 is about 624.8982490357.

Adding to 244021405 its reverse (504120442), we get a palindrome (748141847).

The spelling of 244021405 in words is "two hundred forty-four million, twenty-one thousand, four hundred five".