1388740 has 24 divisors (see below), whose sum is σ = 3044160. Its totient is φ = 531168.

The previous prime is 1388719. The next prime is 1388743. The reversal of 1388740 is 478831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1388743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1050 + ... + 1969.

It is an arithmetic number, because the mean of its divisors is an integer number (126840).

2^1388740 is an apocalyptic number.

1388740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388740 is an abundant number, since it is smaller than the sum of its proper divisors (1655420).

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

1388740 is a wasteful number, since it uses less digits than its factorization.

1388740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051 (or 3049 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1388740 is about 1178.4481320788. The cubic root of 1388740 is about 111.5681713594.

Subtracting from 1388740 its reverse (478831), we obtain a palindrome (909909).

The spelling of 1388740 in words is "one million, three hundred eighty-eight thousand, seven hundred forty".