1681977 has 8 divisors (see below), whose sum is σ = 2446560. Its totient is φ = 1019360.

The previous prime is 1681973. The next prime is 1681991. The reversal of 1681977 is 7791861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1681977 - 2² = 1681973 is a prime.

It is a super-3 number, since 3×1681977³ = 14275174083339965499, which contains 333 as substring.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1681973) by changing a digit.

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, 25452 + ... + 25517.

It is an arithmetic number, because the mean of its divisors is an integer number (305820).

2^1681977 is an apocalyptic number.

It is an amenable number.

1681977 is a deficient number, since it is larger than the sum of its proper divisors (764583).

1681977 is a wasteful number, since it uses less digits than its factorization.

1681977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50983.

The product of its digits is 21168, while the sum is 39.

The square root of 1681977 is about 1296.9105597534. The cubic root of 1681977 is about 118.9250522584.

It can be divided in two parts, 168 and 1977, that added together give a triangular number (2145 = T₆₅).

The spelling of 1681977 in words is "one million, six hundred eighty-one thousand, nine hundred seventy-seven".