1388870 has 16 divisors (see below), whose sum is σ = 2857248. Its totient is φ = 476160.

The previous prime is 1388837. The next prime is 1388873. The reversal of 1388870 is 788831.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388873) 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, 9851 + ... + 9990.

It is an arithmetic number, because the mean of its divisors is an integer number (178578).

2^1388870 is an apocalyptic number.

1388870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1388870 is an abundant number, since it is smaller than the sum of its proper divisors (1468378).

1388870 is a wasteful number, since it uses less digits than its factorization.

1388870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19855.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 1388870 is about 1178.5032880735. The cubic root of 1388870 is about 111.5716525510.

The spelling of 1388870 in words is "one million, three hundred eighty-eight thousand, eight hundred seventy".