8121965 has 8 divisors (see below), whose sum is σ = 9864288. Its totient is φ = 6418960.

The previous prime is 8121959. The next prime is 8121973. The reversal of 8121965 is 5691218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8121965 - 2⁶ = 8121901 is a prime.

It is a super-2 number, since 2×8121965² = 131932630922450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9371 + ... + 10200.

It is an arithmetic number, because the mean of its divisors is an integer number (1233036).

Almost surely, 2^8121965 is an apocalyptic number.

It is an amenable number.

8121965 is a deficient number, since it is larger than the sum of its proper divisors (1742323).

8121965 is a wasteful number, since it uses less digits than its factorization.

8121965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19659.

The product of its digits is 4320, while the sum is 32.

The square root of 8121965 is about 2849.9061388053. The cubic root of 8121965 is about 201.0112532168.

The spelling of 8121965 in words is "eight million, one hundred twenty-one thousand, nine hundred sixty-five".