1228260865 has 8 divisors (see below), whose sum is σ = 1587291048. Its totient is φ = 907023360.

The previous prime is 1228260857. The next prime is 1228260877. The reversal of 1228260865 is 5680628221.

It can be written as a sum of positive squares in 4 ways, for example, as 178929 + 1228081936 = 423^2 + 35044^2 .

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

It is not a de Polignac number, because 1228260865 - 2³ = 1228260857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9448096 + ... + 9448225.

It is an arithmetic number, because the mean of its divisors is an integer number (198411381).

Almost surely, 2^1228260865 is an apocalyptic number.

It is an amenable number.

1228260865 is a deficient number, since it is larger than the sum of its proper divisors (359030183).

1228260865 is a wasteful number, since it uses less digits than its factorization.

1228260865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18896339.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 1228260865 is about 35046.5528262053. The cubic root of 1228260865 is about 1070.9360501965.

The spelling of 1228260865 in words is "one billion, two hundred twenty-eight million, two hundred sixty thousand, eight hundred sixty-five".