1389121 has 8 divisors (see below), whose sum is σ = 1507464. Its totient is φ = 1274880.

The previous prime is 1389107. The next prime is 1389133. The reversal of 1389121 is 1219831.

It can be written as a sum of positive squares in 4 ways, for example, as 190096 + 1199025 = 436^2 + 1095^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389121 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389191) 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, 300 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (188433).

2^1389121 is an apocalyptic number.

It is an amenable number.

1389121 is a deficient number, since it is larger than the sum of its proper divisors (118343).

1389121 is a wasteful number, since it uses less digits than its factorization.

1389121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051.

The product of its digits is 432, while the sum is 25.

The square root of 1389121 is about 1178.6097742680. The cubic root of 1389121 is about 111.5783733139.

The spelling of 1389121 in words is "one million, three hundred eighty-nine thousand, one hundred twenty-one".