1388865197 has 8 divisors (see below), whose sum is σ = 1396937016. Its totient is φ = 1380817152.

The previous prime is 1388865157. The next prime is 1388865227. The reversal of 1388865197 is 7915688831.

It can be written as a sum of positive squares in 4 ways, for example, as 153412996 + 1235452201 = 12386^2 + 35149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1388865197 - 2¹⁸ = 1388603053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388865157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118673 + ... + 129849.

It is an arithmetic number, because the mean of its divisors is an integer number (174617127).

Almost surely, 2^1388865197 is an apocalyptic number.

It is an amenable number.

1388865197 is a deficient number, since it is larger than the sum of its proper divisors (8071819).

1388865197 is a wasteful number, since it uses less digits than its factorization.

1388865197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11887.

The product of its digits is 2903040, while the sum is 56.

The square root of 1388865197 is about 37267.4817635965. The cubic root of 1388865197 is about 1115.7152393818.

The spelling of 1388865197 in words is "one billion, three hundred eighty-eight million, eight hundred sixty-five thousand, one hundred ninety-seven".