1388993798 has 16 divisors (see below), whose sum is σ = 2094094080. Its totient is φ = 690971400.

The previous prime is 1388993761. The next prime is 1388993807. The reversal of 1388993798 is 8973998831.

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, 390713 + ... + 394251.

It is an arithmetic number, because the mean of its divisors is an integer number (130880880).

Almost surely, 2^1388993798 is an apocalyptic number.

1388993798 is a deficient number, since it is larger than the sum of its proper divisors (705100282).

1388993798 is a wasteful number, since it uses less digits than its factorization.

1388993798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483.

The product of its digits is 23514624, while the sum is 65.

The square root of 1388993798 is about 37269.2071018421. The cubic root of 1388993798 is about 1115.7496746093.

The spelling of 1388993798 in words is "one billion, three hundred eighty-eight million, nine hundred ninety-three thousand, seven hundred ninety-eight".