1672661 has 4 divisors (see below), whose sum is σ = 1689324. Its totient is φ = 1656000.

The previous prime is 1672651. The next prime is 1672663. The reversal of 1672661 is 1662761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 844561 + 828100 = 919^2 + 910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1672661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672663) 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 3 ways as a sum of consecutive naturals, for example, 8180 + ... + 8381.

It is an arithmetic number, because the mean of its divisors is an integer number (422331).

2^1672661 is an apocalyptic number.

It is an amenable number.

1672661 is a deficient number, since it is larger than the sum of its proper divisors (16663).

1672661 is a wasteful number, since it uses less digits than its factorization.

1672661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16662.

The product of its digits is 3024, while the sum is 29.

The square root of 1672661 is about 1293.3139603360. The cubic root of 1672661 is about 118.7050814415.

The spelling of 1672661 in words is "one million, six hundred seventy-two thousand, six hundred sixty-one".