1678141 has 4 divisors (see below), whose sum is σ = 1681884. Its totient is φ = 1674400.

The previous prime is 1678133. The next prime is 1678151. The reversal of 1678141 is 1418761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1418761 = 79 ⋅17959.

It can be written as a sum of positive squares in 2 ways, for example, as 894916 + 783225 = 946^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678141 - 2³ = 1678133 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090 + ... + 2131.

It is an arithmetic number, because the mean of its divisors is an integer number (420471).

2^1678141 is an apocalyptic number.

It is an amenable number.

1678141 is a deficient number, since it is larger than the sum of its proper divisors (3743).

1678141 is an equidigital number, since it uses as much as digits as its factorization.

1678141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742.

The product of its digits is 1344, while the sum is 28.

The square root of 1678141 is about 1295.4308163696. The cubic root of 1678141 is about 118.8345746540.

The spelling of 1678141 in words is "one million, six hundred seventy-eight thousand, one hundred forty-one".