1678142 has 4 divisors (see below), whose sum is σ = 2517216. Its totient is φ = 839070.

The previous prime is 1678133. The next prime is 1678151. The reversal of 1678142 is 2418761.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1678133) and next prime (1678151).

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 419534 + ... + 419537.

It is an arithmetic number, because the mean of its divisors is an integer number (629304).

2^1678142 is an apocalyptic number.

1678142 is a deficient number, since it is larger than the sum of its proper divisors (839074).

1678142 is an equidigital number, since it uses as much as digits as its factorization.

1678142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839073.

The product of its digits is 2688, while the sum is 29.

The square root of 1678142 is about 1295.4312023415. The cubic root of 1678142 is about 118.8345982584.

The spelling of 1678142 in words is "one million, six hundred seventy-eight thousand, one hundred forty-two".