1388931 has 8 divisors (see below), whose sum is σ = 1857360. Its totient is φ = 923232.

The previous prime is 1388927. The next prime is 1388941. The reversal of 1388931 is 1398831.

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

It is not a de Polignac number, because 1388931 - 2² = 1388927 is a prime.

It is a super-2 number, since 2×1388931² = 3858258645522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1388892 and 1388901.

It is not an unprimeable number, because it can be changed into a prime (1388941) 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, 1605 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (232170).

2^1388931 is an apocalyptic number.

1388931 is a deficient number, since it is larger than the sum of its proper divisors (468429).

1388931 is an equidigital number, since it uses as much as digits as its factorization.

1388931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365.

The product of its digits is 5184, while the sum is 33.

The square root of 1388931 is about 1178.5291680735. The cubic root of 1388931 is about 111.5732859582.

The spelling of 1388931 in words is "one million, three hundred eighty-eight thousand, nine hundred thirty-one".