1388260 has 24 divisors (see below), whose sum is σ = 2988216. Its totient is φ = 541440.

The previous prime is 1388243. The next prime is 1388269. The reversal of 1388260 is 628831.

It can be written as a sum of positive squares in 4 ways, for example, as 576 + 1387684 = 24^2 + 1178^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (124509).

2^1388260 is an apocalyptic number.

1388260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494108).

1388260 is an abundant number, since it is smaller than the sum of its proper divisors (1599956).

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

1388260 is a wasteful number, since it uses less digits than its factorization.

1388260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743 (or 1741 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1388260 is about 1178.2444568085. The cubic root of 1388260 is about 111.5553158469. Note that the first 3 decimals are identical.

The spelling of 1388260 in words is "one million, three hundred eighty-eight thousand, two hundred sixty".