1397908247 has 2 divisors, whose sum is σ = 1397908248. Its totient is φ = 1397908246.

The previous prime is 1397908219. The next prime is 1397908271. The reversal of 1397908247 is 7428097931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1397908247 - 2¹⁴ = 1397891863 is a prime.

It is a super-2 number, since 2×1397908247² = 3908294934061226018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1397908195 and 1397908204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397908217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698954123 + 698954124.

It is an arithmetic number, because the mean of its divisors is an integer number (698954124).

Almost surely, 2^1397908247 is an apocalyptic number.

1397908247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397908247 is an equidigital number, since it uses as much as digits as its factorization.

1397908247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 1397908247 is about 37388.6111937847. The cubic root of 1397908247 is about 1118.1315165255.

The spelling of 1397908247 in words is "one billion, three hundred ninety-seven million, nine hundred eight thousand, two hundred forty-seven".