1397744851 has 2 divisors, whose sum is σ = 1397744852. Its totient is φ = 1397744850.

The previous prime is 1397744849. The next prime is 1397744857. The reversal of 1397744851 is 1584477931.

It is a weak prime.

It is an emirp because it is prime and its reverse (1584477931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1397744851 - 2¹ = 1397744849 is a prime.

Together with 1397744849, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1397744795 and 1397744804.

It is not a weakly prime, because it can be changed into another prime (1397744857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698872425 + 698872426.

It is an arithmetic number, because the mean of its divisors is an integer number (698872426).

Almost surely, 2^1397744851 is an apocalyptic number.

1397744851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397744851 is an equidigital number, since it uses as much as digits as its factorization.

1397744851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 1397744851 is about 37386.4260260325. The cubic root of 1397744851 is about 1118.0879501621.

The spelling of 1397744851 in words is "one billion, three hundred ninety-seven million, seven hundred forty-four thousand, eight hundred fifty-one".