1396857149 has 2 divisors, whose sum is σ = 1396857150. Its totient is φ = 1396857148.

The previous prime is 1396857101. The next prime is 1396857151. The reversal of 1396857149 is 9417586931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1118568025 + 278289124 = 33445^2 + 16682^2 .

It is a cyclic number.

It is not a de Polignac number, because 1396857149 - 2¹² = 1396853053 is a prime.

It is a Sophie Germain prime.

Together with 1396857151, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1396857149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1396857349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698428574 + 698428575.

It is an arithmetic number, because the mean of its divisors is an integer number (698428575).

Almost surely, 2^1396857149 is an apocalyptic number.

It is an amenable number.

1396857149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396857149 is an equidigital number, since it uses as much as digits as its factorization.

1396857149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 53.

The square root of 1396857149 is about 37374.5521578520. The cubic root of 1396857149 is about 1117.8512023513.

It can be divided in two parts, 13968 and 57149, that added together give a palindrome (71117).

The spelling of 1396857149 in words is "one billion, three hundred ninety-six million, eight hundred fifty-seven thousand, one hundred forty-nine".