1388669197 has 4 divisors (see below), whose sum is σ = 1388746620. Its totient is φ = 1388591776.

The previous prime is 1388669179. The next prime is 1388669231. The reversal of 1388669197 is 7919668831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 322058916 + 1066610281 = 17946^2 + 32659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388669197 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 (1388669167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3633 + ... + 52825.

It is an arithmetic number, because the mean of its divisors is an integer number (347186655).

Almost surely, 2^1388669197 is an apocalyptic number.

It is an amenable number.

1388669197 is a deficient number, since it is larger than the sum of its proper divisors (77423).

1388669197 is an equidigital number, since it uses as much as digits as its factorization.

1388669197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77422.

The product of its digits is 3919104, while the sum is 58.

The square root of 1388669197 is about 37264.8520324447. The cubic root of 1388669197 is about 1115.6627527725.

The spelling of 1388669197 in words is "one billion, three hundred eighty-eight million, six hundred sixty-nine thousand, one hundred ninety-seven".