1393338001778 has 18 divisors (see below), whose sum is σ = 2094591842733. Its totient is φ = 695144064280.

The previous prime is 1393338001771. The next prime is 1393338001813. The reversal of 1393338001778 is 8771008333931.

It can be written as a sum of positive squares in 2 ways, for example, as 1372944162529 + 20393839249 = 1171727^2 + 142807^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=834667.

It is a super-2 number, since 2×1393338001778² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1393338001771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1480698788 + ... + 1480699728.

Almost surely, 2^{1393338001778} is an apocalyptic number.

1393338001778 is a deficient number, since it is larger than the sum of its proper divisors (701253840955).

1393338001778 is an frugal number, since it uses more digits than its factorization.

1393338001778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 1393338001778 in words is "one trillion, three hundred ninety-three billion, three hundred thirty-eight million, one thousand, seven hundred seventy-eight".