1388606020 has 12 divisors (see below), whose sum is σ = 2916072684. Its totient is φ = 555442400.

The previous prime is 1388605997. The next prime is 1388606027. The reversal of 1388606020 is 206068831.

It can be written as a sum of positive squares in 2 ways, for example, as 499254336 + 889351684 = 22344^2 + 29822^2 .

It is not an unprimeable number, because it can be changed into a prime (1388606027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34715131 + ... + 34715170.

It is an arithmetic number, because the mean of its divisors is an integer number (243006057).

Almost surely, 2^1388606020 is an apocalyptic number.

1388606020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388606020 is an abundant number, since it is smaller than the sum of its proper divisors (1527466664).

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

1388606020 is a wasteful number, since it uses less digits than its factorization.

1388606020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69430310 (or 69430308 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1388606020 is about 37264.0043473591. The cubic root of 1388606020 is about 1115.6458336256.

The spelling of 1388606020 in words is "one billion, three hundred eighty-eight million, six hundred six thousand, twenty".