1396543657 has 2 divisors, whose sum is σ = 1396543658. Its totient is φ = 1396543656.

The previous prime is 1396543639. The next prime is 1396543697. The reversal of 1396543657 is 7563456931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1358954496 + 37589161 = 36864^2 + 6131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1396543657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1396543657.

It is not a weakly prime, because it can be changed into another prime (1396543607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698271828 + 698271829.

It is an arithmetic number, because the mean of its divisors is an integer number (698271829).

Almost surely, 2^1396543657 is an apocalyptic number.

It is an amenable number.

1396543657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396543657 is an equidigital number, since it uses as much as digits as its factorization.

1396543657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 49.

The square root of 1396543657 is about 37370.3579993556. The cubic root of 1396543657 is about 1117.7675708866.

The spelling of 1396543657 in words is "one billion, three hundred ninety-six million, five hundred forty-three thousand, six hundred fifty-seven".