1676405 has 4 divisors (see below), whose sum is σ = 2011692. Its totient is φ = 1341120.

The previous prime is 1676393. The next prime is 1676413. The reversal of 1676405 is 5046761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5046761 = 19 ⋅265619.

It can be written as a sum of positive squares in 2 ways, for example, as 758641 + 917764 = 871^2 + 958^2 .

It is not a de Polignac number, because 1676405 - 2¹⁸ = 1414261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167636 + ... + 167645.

It is an arithmetic number, because the mean of its divisors is an integer number (502923).

2^1676405 is an apocalyptic number.

It is an amenable number.

1676405 is a deficient number, since it is larger than the sum of its proper divisors (335287).

1676405 is an equidigital number, since it uses as much as digits as its factorization.

1676405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335286.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1676405 is about 1294.7605956315. The cubic root of 1676405 is about 118.7935832636.

The spelling of 1676405 in words is "one million, six hundred seventy-six thousand, four hundred five".