1388739 has 8 divisors (see below), whose sum is σ = 2020032. Its totient is φ = 841640.

The previous prime is 1388719. The next prime is 1388743. The reversal of 1388739 is 9378831.

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

It is a cyclic number.

It is not a de Polignac number, because 1388739 - 2⁸ = 1388483 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1388697 and 1388706.

It is not an unprimeable number, because it can be changed into a prime (1388719) 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, 21009 + ... + 21074.

It is an arithmetic number, because the mean of its divisors is an integer number (252504).

2^1388739 is an apocalyptic number.

1388739 is a deficient number, since it is larger than the sum of its proper divisors (631293).

1388739 is a wasteful number, since it uses less digits than its factorization.

1388739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42097.

The product of its digits is 36288, while the sum is 39.

The square root of 1388739 is about 1178.4477077919. The cubic root of 1388739 is about 111.5681445802.

The spelling of 1388739 in words is "one million, three hundred eighty-eight thousand, seven hundred thirty-nine".