7820945 has 16 divisors (see below), whose sum is σ = 10435392. Its totient is φ = 5578560.

The previous prime is 7820929. The next prime is 7820947. The reversal of 7820945 is 5490287.

It is a happy number.

It is not a de Polignac number, because 7820945 - 2⁴ = 7820929 is a prime.

It is a super-2 number, since 2×7820945² = 122334361386050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7820947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1574 + ... + 4256.

It is an arithmetic number, because the mean of its divisors is an integer number (652212).

Almost surely, 2^7820945 is an apocalyptic number.

It is an amenable number.

7820945 is a deficient number, since it is larger than the sum of its proper divisors (2614447).

7820945 is a wasteful number, since it uses less digits than its factorization.

7820945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 7820945 is about 2796.5952513726. The cubic root of 7820945 is about 198.4966022932.

The spelling of 7820945 in words is "seven million, eight hundred twenty thousand, nine hundred forty-five".