1405457 has 4 divisors (see below), whose sum is σ = 1409460. Its totient is φ = 1401456.

The previous prime is 1405451. The next prime is 1405477. The reversal of 1405457 is 7545041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7545041 = 7 ⋅1077863.

It can be written as a sum of positive squares in 2 ways, for example, as 96721 + 1308736 = 311^2 + 1144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1405457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405451) 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, 1418 + ... + 2195.

It is an arithmetic number, because the mean of its divisors is an integer number (352365).

2^1405457 is an apocalyptic number.

It is an amenable number.

1405457 is a deficient number, since it is larger than the sum of its proper divisors (4003).

1405457 is an equidigital number, since it uses as much as digits as its factorization.

1405457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 1405457 is about 1185.5197172548. The cubic root of 1405457 is about 112.0140554214.

The spelling of 1405457 in words is "one million, four hundred five thousand, four hundred fifty-seven".