7857157 has 16 divisors (see below), whose sum is σ = 9948672. Its totient is φ = 6027120.

The previous prime is 7857137. The next prime is 7857163. The reversal of 7857157 is 7517587.

It is a happy number.

It is not a de Polignac number, because 7857157 - 2¹¹ = 7855109 is a prime.

It is a super-2 number, since 2×7857157² = 123469832245298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7857107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4398 + ... + 5920.

It is an arithmetic number, because the mean of its divisors is an integer number (621792).

Almost surely, 2^7857157 is an apocalyptic number.

7857157 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

7857157 is a deficient number, since it is larger than the sum of its proper divisors (2091515).

7857157 is a wasteful number, since it uses less digits than its factorization.

7857157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608.

The product of its digits is 68600, while the sum is 40.

The square root of 7857157 is about 2803.0620756594. The cubic root of 7857157 is about 198.8024857758.

The spelling of 7857157 in words is "seven million, eight hundred fifty-seven thousand, one hundred fifty-seven".