1405389 has 4 divisors (see below), whose sum is σ = 1873856. Its totient is φ = 936924.

The previous prime is 1405387. The next prime is 1405403. The reversal of 1405389 is 9835041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9835041 = 3 ⋅3278347.

It is not a de Polignac number, because 1405389 - 2¹ = 1405387 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405387) 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, 234229 + ... + 234234.

It is an arithmetic number, because the mean of its divisors is an integer number (468464).

2^1405389 is an apocalyptic number.

It is an amenable number.

1405389 is a deficient number, since it is larger than the sum of its proper divisors (468467).

1405389 is an equidigital number, since it uses as much as digits as its factorization.

1405389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468466.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1405389 is about 1185.4910375030. The cubic root of 1405389 is about 112.0122488729.

The spelling of 1405389 in words is "one million, four hundred five thousand, three hundred eighty-nine".