1388020 has 12 divisors (see below), whose sum is σ = 2914884. Its totient is φ = 555200.

The previous prime is 1388011. The next prime is 1388021. The reversal of 1388020 is 208831.

It can be written as a sum of positive squares in 2 ways, for example, as 712336 + 675684 = 844^2 + 822^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1387982 and 1388000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388021) 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, 34681 + ... + 34720.

It is an arithmetic number, because the mean of its divisors is an integer number (242907).

2^1388020 is an apocalyptic number.

1388020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388020 is an abundant number, since it is smaller than the sum of its proper divisors (1526864).

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

1388020 is a wasteful number, since it uses less digits than its factorization.

1388020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69410 (or 69408 counting only the distinct ones).

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

The square root of 1388020 is about 1178.1426059692. The cubic root of 1388020 is about 111.5488869794.

The spelling of 1388020 in words is "one million, three hundred eighty-eight thousand, twenty".