1205243428 has 12 divisors (see below), whose sum is σ = 2115256752. Its totient is φ = 600884360.

The previous prime is 1205243387. The next prime is 1205243477. The reversal of 1205243428 is 8243425021.

It is a super-2 number, since 2×1205243428² = 2905223441474382368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1205243428.

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, 432778 + ... + 435553.

It is an arithmetic number, because the mean of its divisors is an integer number (176271396).

Almost surely, 2^1205243428 is an apocalyptic number.

It is an amenable number.

1205243428 is a deficient number, since it is larger than the sum of its proper divisors (910013324).

1205243428 is a wasteful number, since it uses less digits than its factorization.

1205243428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868682 (or 868680 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 1205243428 is about 34716.6160217265. The cubic root of 1205243428 is about 1064.2040907706.

Adding to 1205243428 its reverse (8243425021), we get a palindrome (9448668449).

The spelling of 1205243428 in words is "one billion, two hundred five million, two hundred forty-three thousand, four hundred twenty-eight".