1388845 has 8 divisors (see below), whose sum is σ = 1685880. Its totient is φ = 1098240.

The previous prime is 1388837. The next prime is 1388873. The reversal of 1388845 is 5488831.

It can be written as a sum of positive squares in 4 ways, for example, as 68644 + 1320201 = 262^2 + 1149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1388845 - 2³ = 1388837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116 + ... + 2005.

It is an arithmetic number, because the mean of its divisors is an integer number (210735).

2^1388845 is an apocalyptic number.

It is an amenable number.

1388845 is a deficient number, since it is larger than the sum of its proper divisors (297035).

1388845 is an equidigital number, since it uses as much as digits as its factorization.

1388845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215.

The product of its digits is 30720, while the sum is 37.

The square root of 1388845 is about 1178.4926813519. The cubic root of 1388845 is about 111.5709831079.

The spelling of 1388845 in words is "one million, three hundred eighty-eight thousand, eight hundred forty-five".