1397977247 has 2 divisors, whose sum is σ = 1397977248. Its totient is φ = 1397977246.

The previous prime is 1397977241. The next prime is 1397977313. The reversal of 1397977247 is 7427797931.

It is a weak prime.

It is an emirp because it is prime and its reverse (7427797931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1397977247 - 2⁸ = 1397976991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1397977192 and 1397977201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397977241) by changing a digit.

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 as a sum of consecutive naturals, namely, 698988623 + 698988624.

It is an arithmetic number, because the mean of its divisors is an integer number (698988624).

Almost surely, 2^1397977247 is an apocalyptic number.

1397977247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397977247 is an equidigital number, since it uses as much as digits as its factorization.

1397977247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4667544, while the sum is 56.

The square root of 1397977247 is about 37389.5339232786. The cubic root of 1397977247 is about 1118.1499130131.

The spelling of 1397977247 in words is "one billion, three hundred ninety-seven million, nine hundred seventy-seven thousand, two hundred forty-seven".