1670681 has 4 divisors (see below), whose sum is σ = 1674000. Its totient is φ = 1667364.

The previous prime is 1670659. The next prime is 1670687. The reversal of 1670681 is 1860761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1670681 is a prime.

It is a super-2 number, since 2×1670681² = 5582350007522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1670687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731 + ... + 1968.

It is an arithmetic number, because the mean of its divisors is an integer number (418500).

2^1670681 is an apocalyptic number.

It is an amenable number.

1670681 is a deficient number, since it is larger than the sum of its proper divisors (3319).

1670681 is an equidigital number, since it uses as much as digits as its factorization.

1670681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1670681 is about 1292.5482582867. The cubic root of 1670681 is about 118.6582241956.

The spelling of 1670681 in words is "one million, six hundred seventy thousand, six hundred eighty-one".