1397719 has 2 divisors, whose sum is σ = 1397720. Its totient is φ = 1397718.

The previous prime is 1397717. The next prime is 1397729. The reversal of 1397719 is 9177931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1397719 - 2¹ = 1397717 is a prime.

It is a super-2 number, since 2×1397719² = 3907236805922, which contains 22 as substring.

Together with 1397717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698859 + 698860.

It is an arithmetic number, because the mean of its divisors is an integer number (698860).

2^1397719 is an apocalyptic number.

1397719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397719 is an equidigital number, since it uses as much as digits as its factorization.

1397719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11907, while the sum is 37.

The square root of 1397719 is about 1182.2516652558. The cubic root of 1397719 is about 111.8081057185.

It can be divided in two parts, 1397 and 719, that added together give a square (2116 = 46²).

The spelling of 1397719 in words is "one million, three hundred ninety-seven thousand, seven hundred nineteen".