7869921 has 8 divisors (see below), whose sum is σ = 10595520. Its totient is φ = 5195472.

The previous prime is 7869919. The next prime is 7869923. The reversal of 7869921 is 1299687.

It is an interprime number because it is at equal distance from previous prime (7869919) and next prime (7869923).

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

It is not a de Polignac number, because 7869921 - 2¹ = 7869919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7869923) 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 7 ways as a sum of consecutive naturals, for example, 12426 + ... + 13043.

It is an arithmetic number, because the mean of its divisors is an integer number (1324440).

Almost surely, 2^7869921 is an apocalyptic number.

It is an amenable number.

7869921 is a deficient number, since it is larger than the sum of its proper divisors (2725599).

7869921 is a wasteful number, since it uses less digits than its factorization.

7869921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25575.

The product of its digits is 54432, while the sum is 42.

The square root of 7869921 is about 2805.3379475564. The cubic root of 7869921 is about 198.9100794893.

The spelling of 7869921 in words is "seven million, eight hundred sixty-nine thousand, nine hundred twenty-one".