1398647897 has 4 divisors (see below), whose sum is σ = 1398779316. Its totient is φ = 1398516480.

The previous prime is 1398647881. The next prime is 1398647927. The reversal of 1398647897 is 7987468931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7987468931 = 13 ⋅614420687.

It can be written as a sum of positive squares in 2 ways, for example, as 666620761 + 732027136 = 25819^2 + 27056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398647897 - 2⁴ = 1398647881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398647827) 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 in 3 ways as a sum of consecutive naturals, for example, 48188 + ... + 71549.

It is an arithmetic number, because the mean of its divisors is an integer number (349694829).

Almost surely, 2^1398647897 is an apocalyptic number.

It is an amenable number.

1398647897 is a deficient number, since it is larger than the sum of its proper divisors (131419).

1398647897 is a wasteful number, since it uses less digits than its factorization.

1398647897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131418.

The product of its digits is 18289152, while the sum is 62.

The square root of 1398647897 is about 37398.5012667620. The cubic root of 1398647897 is about 1118.3286873479.

The spelling of 1398647897 in words is "one billion, three hundred ninety-eight million, six hundred forty-seven thousand, eight hundred ninety-seven".