1388728199 has 2 divisors, whose sum is σ = 1388728200. Its totient is φ = 1388728198.

The previous prime is 1388728193. The next prime is 1388728217. The reversal of 1388728199 is 9918278831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1388728199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1388728193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694364099 + 694364100.

It is an arithmetic number, because the mean of its divisors is an integer number (694364100).

Almost surely, 2^1388728199 is an apocalyptic number.

1388728199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388728199 is an equidigital number, since it uses as much as digits as its factorization.

1388728199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 56.

The square root of 1388728199 is about 37265.6436815467. The cubic root of 1388728199 is about 1115.6785533682.

The spelling of 1388728199 in words is "one billion, three hundred eighty-eight million, seven hundred twenty-eight thousand, one hundred ninety-nine".