1243604405 has 8 divisors (see below), whose sum is σ = 1513344384. Its totient is φ = 980870800.

The previous prime is 1243604389. The next prime is 1243604407. The reversal of 1243604405 is 5044063421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243604405 - 2⁴ = 1243604389 is a prime.

It is a super-2 number, since 2×1243604405² = 3093103832270808050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243604407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1751201 + ... + 1751910.

It is an arithmetic number, because the mean of its divisors is an integer number (189168048).

Almost surely, 2^1243604405 is an apocalyptic number.

It is an amenable number.

1243604405 is a deficient number, since it is larger than the sum of its proper divisors (269739979).

1243604405 is an equidigital number, since it uses as much as digits as its factorization.

1243604405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503187.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 1243604405 is about 35264.7756975711. The cubic root of 1243604405 is about 1075.3770172096.

Adding to 1243604405 its reverse (5044063421), we get a palindrome (6287667826).

The spelling of 1243604405 in words is "one billion, two hundred forty-three million, six hundred four thousand, four hundred five".