1388020000 has 60 divisors (see below), whose sum is σ = 3414786606. Its totient is φ = 555200000.

The previous prime is 1388019991. The next prime is 1388020087. The reversal of 1388020000 is 208831.

It can be written as a sum of positive squares in 5 ways, for example, as 51093904 + 1336926096 = 7148^2 + 36564^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14701 + ... + 54700.

Almost surely, 2^1388020000 is an apocalyptic number.

1388020000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388020000 is an abundant number, since it is smaller than the sum of its proper divisors (2026766606).

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

1388020000 is an frugal number, since it uses more digits than its factorization.

1388020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69431 (or 69408 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1388020000 is about 37256.1404334910. The cubic root of 1388020000 is about 1115.4888697941.

Adding to 1388020000 its reverse (208831), we get a palindrome (1388228831).

The spelling of 1388020000 in words is "one billion, three hundred eighty-eight million, twenty thousand".