1679945 has 8 divisors (see below), whose sum is σ = 2023944. Its totient is φ = 1338624.

The previous prime is 1679939. The next prime is 1679959. The reversal of 1679945 is 5499761.

1679945 = 916² + 917².

It can be written as a sum of positive squares in 4 ways, for example, as 259081 + 1420864 = 509^2 + 1192^2 .

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 1679945 - 2¹⁰ = 1678921 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 7² + 9 + 9 + 4⁴ + 5 .

It is a Duffinian number.

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1187 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (252993).

2^1679945 is an apocalyptic number.

1679945 is the 917-th centered square number.

It is an amenable number.

1679945 is a deficient number, since it is larger than the sum of its proper divisors (343999).

1679945 is an equidigital number, since it uses as much as digits as its factorization.

1679945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339.

The product of its digits is 68040, while the sum is 41.

The square root of 1679945 is about 1296.1269227973. The cubic root of 1679945 is about 118.8771417566.

The spelling of 1679945 in words is "one million, six hundred seventy-nine thousand, nine hundred forty-five".