7900857 has 6 divisors (see below), whose sum is σ = 11412362. Its totient is φ = 5267232.

The previous prime is 7900829. The next prime is 7900859. The reversal of 7900857 is 7580097.

It can be written as a sum of positive squares in only one way, i.e., 4016016 + 3884841 = 2004^2 + 1971^2 .

It is not a de Polignac number, because 7900857 - 2⁶ = 7900793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7900859) 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 5 ways as a sum of consecutive naturals, for example, 438928 + ... + 438945.

Almost surely, 2^7900857 is an apocalyptic number.

It is an amenable number.

7900857 is a deficient number, since it is larger than the sum of its proper divisors (3511505).

7900857 is a wasteful number, since it uses less digits than its factorization.

7900857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877879 (or 877876 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 7900857 is about 2810.8463138350. The cubic root of 7900857 is about 199.1703716760.

The spelling of 7900857 in words is "seven million, nine hundred thousand, eight hundred fifty-seven".