1228038991393 has 8 divisors (see below), whose sum is σ = 1345113703080. Its totient is φ = 1115946182400.

The previous prime is 1228038991367. The next prime is 1228038991409. The reversal of 1228038991393 is 3931998308221.

It can be written as a sum of positive squares in 4 ways, for example, as 342046013409 + 885992977984 = 584847^2 + 941272^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1228038991393 - 2²¹ = 1228036894241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228038994393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1245475158 + ... + 1245476143.

It is an arithmetic number, because the mean of its divisors is an integer number (168139212885).

Almost surely, 2^{1228038991393} is an apocalyptic number.

It is an amenable number.

1228038991393 is a deficient number, since it is larger than the sum of its proper divisors (117074711687).

1228038991393 is a wasteful number, since it uses less digits than its factorization.

1228038991393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490951347.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 1228038991393 in words is "one trillion, two hundred twenty-eight billion, thirty-eight million, nine hundred ninety-one thousand, three hundred ninety-three".