1388340 has 60 divisors (see below), whose sum is σ = 4360356. Its totient is φ = 369792.

The previous prime is 1388327. The next prime is 1388353. The reversal of 1388340 is 438831.

It is an interprime number because it is at equal distance from previous prime (1388327) and next prime (1388353).

It can be written as a sum of positive squares in 2 ways, for example, as 944784 + 443556 = 972^2 + 666^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 1192 + ... + 2048.

2^1388340 is an apocalyptic number.

1388340 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 1388340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2180178).

1388340 is an abundant number, since it is smaller than the sum of its proper divisors (2972016).

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

1388340 is a wasteful number, since it uses less digits than its factorization.

1388340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1388340 is about 1178.2784051318. The cubic root of 1388340 is about 111.5574586381.

It can be divided in two parts, 1388 and 340, that added together give a cube (1728 = 12³).

The spelling of 1388340 in words is "one million, three hundred eighty-eight thousand, three hundred forty".