1397964889 has 4 divisors (see below), whose sum is σ = 1400812560. Its totient is φ = 1395117220.

The previous prime is 1397964857. The next prime is 1397964899. The reversal of 1397964889 is 9884697931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9884697931 = 12983 ⋅761357.

It is a cyclic number.

It is not a de Polignac number, because 1397964889 - 2⁵ = 1397964857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1397964889.

It is not an unprimeable number, because it can be changed into a prime (1397964899) 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 in 3 ways as a sum of consecutive naturals, for example, 1423099 + ... + 1424080.

It is an arithmetic number, because the mean of its divisors is an integer number (350203140).

Almost surely, 2^1397964889 is an apocalyptic number.

It is an amenable number.

1397964889 is a deficient number, since it is larger than the sum of its proper divisors (2847671).

1397964889 is an equidigital number, since it uses as much as digits as its factorization.

1397964889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847670.

The product of its digits is 23514624, while the sum is 64.

The square root of 1397964889 is about 37389.3686627629. The cubic root of 1397964889 is about 1118.1466182201.

The spelling of 1397964889 in words is "one billion, three hundred ninety-seven million, nine hundred sixty-four thousand, eight hundred eighty-nine".