157857217 has 8 divisors (see below), whose sum is σ = 180533376. Its totient is φ = 135212352.

The previous prime is 157857199. The next prime is 157857221. The reversal of 157857217 is 712758751.

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 157857217 - 2²³ = 149468609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157857277) 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 7 ways as a sum of consecutive naturals, for example, 4233 + ... + 18265.

It is an arithmetic number, because the mean of its divisors is an integer number (22566672).

Almost surely, 2^157857217 is an apocalyptic number.

It is an amenable number.

157857217 is a deficient number, since it is larger than the sum of its proper divisors (22676159).

157857217 is a wasteful number, since it uses less digits than its factorization.

157857217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15647.

The product of its digits is 137200, while the sum is 43.

The square root of 157857217 is about 12564.1242034612. The cubic root of 157857217 is about 540.4491199603.

The spelling of 157857217 in words is "one hundred fifty-seven million, eight hundred fifty-seven thousand, two hundred seventeen".