1388877788 has 12 divisors (see below), whose sum is σ = 2489817792. Its totient is φ = 677501280.

The previous prime is 1388877733. The next prime is 1388877799. The reversal of 1388877788 is 8877788831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4234220 + ... + 4234547.

It is an arithmetic number, because the mean of its divisors is an integer number (207484816).

Almost surely, 2^1388877788 is an apocalyptic number.

It is an amenable number.

1388877788 is a deficient number, since it is larger than the sum of its proper divisors (1100940004).

1388877788 is a wasteful number, since it uses less digits than its factorization.

1388877788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8468812 (or 8468810 counting only the distinct ones).

The product of its digits is 33718272, while the sum is 65.

The square root of 1388877788 is about 37267.6506906459. The cubic root of 1388877788 is about 1115.7186109420.

The spelling of 1388877788 in words is "one billion, three hundred eighty-eight million, eight hundred seventy-seven thousand, seven hundred eighty-eight".