6721965 has 12 divisors (see below), whose sum is σ = 11651484. Its totient is φ = 3585024.

The previous prime is 6721961. The next prime is 6721969. The reversal of 6721965 is 5691276.

It is an interprime number because it is at equal distance from previous prime (6721961) and next prime (6721969).

It can be written as a sum of positive squares in 2 ways, for example, as 2082249 + 4639716 = 1443^2 + 2154^2 .

It is not a de Polignac number, because 6721965 - 2² = 6721961 is a prime.

It is a super-2 number, since 2×6721965² = 90369626922450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74644 + ... + 74733.

It is an arithmetic number, because the mean of its divisors is an integer number (970957).

Almost surely, 2^6721965 is an apocalyptic number.

It is an amenable number.

6721965 is a deficient number, since it is larger than the sum of its proper divisors (4929519).

6721965 is a wasteful number, since it uses less digits than its factorization.

6721965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149388 (or 149385 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 6721965 is about 2592.6752592641. The cubic root of 6721965 is about 188.7261508104.

The spelling of 6721965 in words is "six million, seven hundred twenty-one thousand, nine hundred sixty-five".