1389457 has 4 divisors (see below), whose sum is σ = 1403316. Its totient is φ = 1375600.

The previous prime is 1389439. The next prime is 1389469. The reversal of 1389457 is 7549831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7549831 = 29 ⋅260339.

It can be written as a sum of positive squares in 2 ways, for example, as 698896 + 690561 = 836^2 + 831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389457 - 2⁷ = 1389329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6778 + ... + 6979.

It is an arithmetic number, because the mean of its divisors is an integer number (350829).

2^1389457 is an apocalyptic number.

It is an amenable number.

1389457 is a deficient number, since it is larger than the sum of its proper divisors (13859).

1389457 is a wasteful number, since it uses less digits than its factorization.

1389457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13858.

The product of its digits is 30240, while the sum is 37.

The square root of 1389457 is about 1178.7523064665. The cubic root of 1389457 is about 111.5873687652.

The spelling of 1389457 in words is "one million, three hundred eighty-nine thousand, four hundred fifty-seven".