1680994 has 24 divisors (see below), whose sum is σ = 3108780. Its totient is φ = 677376.

The previous prime is 1680983. The next prime is 1681003. The reversal of 1680994 is 4990861.

It can be written as a sum of positive squares in 2 ways, for example, as 1677025 + 3969 = 1295^2 + 63^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1162 + ... + 2170.

2^1680994 is an apocalyptic number.

1680994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1680994 is a deficient number, since it is larger than the sum of its proper divisors (1427786).

1680994 is a wasteful number, since it uses less digits than its factorization.

1680994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1680994 is about 1296.5315268053. The cubic root of 1680994 is about 118.9018799027.

The spelling of 1680994 in words is "one million, six hundred eighty thousand, nine hundred ninety-four".