1679661 has 6 divisors (see below), whose sum is σ = 2426190. Its totient is φ = 1119768.

The previous prime is 1679659. The next prime is 1679669. The reversal of 1679661 is 1669761.

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 447561 = 1110^2 + 669^2 .

It is not a de Polignac number, because 1679661 - 2¹ = 1679659 is a prime.

It is a super-2 number, since 2×1679661² = 5642522149842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1679669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93306 + ... + 93323.

It is an arithmetic number, because the mean of its divisors is an integer number (404365).

2^1679661 is an apocalyptic number.

It is an amenable number.

1679661 is a deficient number, since it is larger than the sum of its proper divisors (746529).

1679661 is a wasteful number, since it uses less digits than its factorization.

1679661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186635 (or 186632 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 1679661 is about 1296.0173609948. The cubic root of 1679661 is about 118.8704425271.

The spelling of 1679661 in words is "one million, six hundred seventy-nine thousand, six hundred sixty-one".