1680956 has 24 divisors (see below), whose sum is σ = 3123120. Its totient is φ = 790272.

The previous prime is 1680929. The next prime is 1680961. The reversal of 1680956 is 6590861.

It is a super-2 number, since 2×1680956² = 5651226147872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 4820 + ... + 5156.

It is an arithmetic number, because the mean of its divisors is an integer number (130130).

2^1680956 is an apocalyptic number.

It is an amenable number.

1680956 is a deficient number, since it is larger than the sum of its proper divisors (1442164).

1680956 is a wasteful number, since it uses less digits than its factorization.

1680956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1680956 is about 1296.5168722388. The cubic root of 1680956 is about 118.9009839437.

The spelling of 1680956 in words is "one million, six hundred eighty thousand, nine hundred fifty-six".