1388865198 has 16 divisors (see below), whose sum is σ = 3174549120. Its totient is φ = 396818616.

The previous prime is 1388865157. The next prime is 1388865227. The reversal of 1388865198 is 8915688831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16534068 + ... + 16534151.

It is an arithmetic number, because the mean of its divisors is an integer number (198409320).

Almost surely, 2^1388865198 is an apocalyptic number.

1388865198 is an abundant number, since it is smaller than the sum of its proper divisors (1785683922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388865198 is a wasteful number, since it uses less digits than its factorization.

1388865198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33068231.

The product of its digits is 3317760, while the sum is 57.

The square root of 1388865198 is about 37267.4817770131. The cubic root of 1388865198 is about 1115.7152396496.

It can be divided in two parts, 1388 and 865198, that added together give a triangular number (866586 = T₁₃₁₆).

The spelling of 1388865198 in words is "one billion, three hundred eighty-eight million, eight hundred sixty-five thousand, one hundred ninety-eight".