1397388780545 has 8 divisors (see below), whose sum is σ = 1676932251624. Its totient is φ = 1117867214464.

The previous prime is 1397388780511. The next prime is 1397388780559. The reversal of 1397388780545 is 5450878837931.

It is a Cunningham number, because it is equal to 1182112²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 57205158976 + 1340183621569 = 239176^2 + 1157663^2 .

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 1397388780545 - 2³⁶ = 1328669303809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5335574 + ... + 5591343.

It is an arithmetic number, because the mean of its divisors is an integer number (209616531453).

Almost surely, 2^{1397388780545} is an apocalyptic number.

It is an amenable number.

1397388780545 is a deficient number, since it is larger than the sum of its proper divisors (279543471079).

1397388780545 is a wasteful number, since it uses less digits than its factorization.

1397388780545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10952499.

The product of its (nonzero) digits is 203212800, while the sum is 68.

The spelling of 1397388780545 in words is "one trillion, three hundred ninety-seven billion, three hundred eighty-eight million, seven hundred eighty thousand, five hundred forty-five".