1678493 has 4 divisors (see below), whose sum is σ = 1681980. Its totient is φ = 1675008.

The previous prime is 1678463. The next prime is 1678507. The reversal of 1678493 is 3948761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3948761 = 293 ⋅13477.

It can be written as a sum of positive squares in 2 ways, for example, as 1592644 + 85849 = 1262^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678493 - 2⁶ = 1678429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678423) 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, 878 + ... + 2031.

It is an arithmetic number, because the mean of its divisors is an integer number (420495).

2^1678493 is an apocalyptic number.

It is an amenable number.

1678493 is a deficient number, since it is larger than the sum of its proper divisors (3487).

1678493 is an equidigital number, since it uses as much as digits as its factorization.

1678493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486.

The product of its digits is 36288, while the sum is 38.

The square root of 1678493 is about 1295.5666713836. The cubic root of 1678493 is about 118.8428828248.

The spelling of 1678493 in words is "one million, six hundred seventy-eight thousand, four hundred ninety-three".