7920643 has 8 divisors (see below), whose sum is σ = 8160768. Its totient is φ = 7683144.

The previous prime is 7920641. The next prime is 7920677. The reversal of 7920643 is 3460297.

7920643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7920643 - 2¹ = 7920641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7920641) 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, 6630 + ... + 7732.

It is an arithmetic number, because the mean of its divisors is an integer number (1020096).

Almost surely, 2^7920643 is an apocalyptic number.

7920643 is a deficient number, since it is larger than the sum of its proper divisors (240125).

7920643 is a wasteful number, since it uses less digits than its factorization.

7920643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 7920643 is about 2814.3636936260. The cubic root of 7920643 is about 199.3364928925.

The spelling of 7920643 in words is "seven million, nine hundred twenty thousand, six hundred forty-three".