7897857 has 8 divisors (see below), whose sum is σ = 11487840. Its totient is φ = 4786560.

The previous prime is 7897849. The next prime is 7897861. The reversal of 7897857 is 7587987.

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

It is not a de Polignac number, because 7897857 - 2³ = 7897849 is a prime.

It is a super-2 number, since 2×7897857² = 124752290384898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7897807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119632 + ... + 119697.

It is an arithmetic number, because the mean of its divisors is an integer number (1435980).

Almost surely, 2^7897857 is an apocalyptic number.

It is an amenable number.

7897857 is a deficient number, since it is larger than the sum of its proper divisors (3589983).

7897857 is a wasteful number, since it uses less digits than its factorization.

7897857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239343.

The product of its digits is 987840, while the sum is 51.

The square root of 7897857 is about 2810.3126160625. The cubic root of 7897857 is about 199.1451597800.

It can be divided in two parts, 789 and 7857, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 7897857 in words is "seven million, eight hundred ninety-seven thousand, eight hundred fifty-seven".