1685974 has 4 divisors (see below), whose sum is σ = 2528964. Its totient is φ = 842986.

The previous prime is 1685963. The next prime is 1685977. The reversal of 1685974 is 4795861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4795861 = 7 ⋅685123.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685977) 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 as a sum of consecutive naturals, namely, 421492 + ... + 421495.

It is an arithmetic number, because the mean of its divisors is an integer number (632241).

2^1685974 is an apocalyptic number.

1685974 is a deficient number, since it is larger than the sum of its proper divisors (842990).

1685974 is an equidigital number, since it uses as much as digits as its factorization.

1685974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842989.

The product of its digits is 60480, while the sum is 40.

The square root of 1685974 is about 1298.4506151564. The cubic root of 1685974 is about 119.0191810524.

The spelling of 1685974 in words is "one million, six hundred eighty-five thousand, nine hundred seventy-four".