1280434345 has 8 divisors (see below), whose sum is σ = 1540473480. Its totient is φ = 1021712640.

The previous prime is 1280434333. The next prime is 1280434391. The reversal of 1280434345 is 5434340821.

It can be written as a sum of positive squares in 4 ways, for example, as 10010896 + 1270423449 = 3164^2 + 35643^2 .

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

It is not a de Polignac number, because 1280434345 - 2¹¹ = 1280432297 is a prime.

It is a super-2 number, since 2×1280434345² = 3279024223711158050, 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 1280434345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327216 + ... + 331105.

It is an arithmetic number, because the mean of its divisors is an integer number (192559185).

Almost surely, 2^1280434345 is an apocalyptic number.

It is an amenable number.

1280434345 is a deficient number, since it is larger than the sum of its proper divisors (260039135).

1280434345 is an equidigital number, since it uses as much as digits as its factorization.

1280434345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658715.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 1280434345 is about 35783.1572810449. The cubic root of 1280434345 is about 1085.8898445950.

The spelling of 1280434345 in words is "one billion, two hundred eighty million, four hundred thirty-four thousand, three hundred forty-five".