1389021 has 8 divisors (see below), whose sum is σ = 1862400. Its totient is φ = 920832.

The previous prime is 1389007. The next prime is 1389083. The reversal of 1389021 is 1209831.

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

It is not a de Polignac number, because 1389021 - 2¹⁵ = 1356253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1388982 and 1389000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389001) 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, 621 + ... + 1778.

It is an arithmetic number, because the mean of its divisors is an integer number (232800).

2^1389021 is an apocalyptic number.

It is an amenable number.

1389021 is a deficient number, since it is larger than the sum of its proper divisors (473379).

1389021 is a wasteful number, since it uses less digits than its factorization.

1389021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1389021 is about 1178.5673506423. The cubic root of 1389021 is about 111.5756958161.

The spelling of 1389021 in words is "one million, three hundred eighty-nine thousand, twenty-one".