1671965 has 4 divisors (see below), whose sum is σ = 2006364. Its totient is φ = 1337568.

The previous prime is 1671961. The next prime is 1671977. The reversal of 1671965 is 5691761.

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 988036 + 683929 = 994^2 + 827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671965 - 2² = 1671961 is a prime.

It is a super-2 number, since 2×1671965² = 5590933922450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671961) 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, 167192 + ... + 167201.

It is an arithmetic number, because the mean of its divisors is an integer number (501591).

2^1671965 is an apocalyptic number.

It is an amenable number.

1671965 is a deficient number, since it is larger than the sum of its proper divisors (334399).

1671965 is an equidigital number, since it uses as much as digits as its factorization.

1671965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334398.

The product of its digits is 11340, while the sum is 35.

The square root of 1671965 is about 1293.0448561438. The cubic root of 1671965 is about 118.6886146263.

The spelling of 1671965 in words is "one million, six hundred seventy-one thousand, nine hundred sixty-five".