385142257 has 4 divisors (see below), whose sum is σ = 385185280. Its totient is φ = 385099236.

The previous prime is 385142239. The next prime is 385142267. The reversal of 385142257 is 752241583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 385142257 - 2¹⁵ = 385109489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385142237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2457 + ... + 27862.

It is an arithmetic number, because the mean of its divisors is an integer number (96296320).

Almost surely, 2^385142257 is an apocalyptic number.

It is an amenable number.

385142257 is a deficient number, since it is larger than the sum of its proper divisors (43023).

385142257 is a wasteful number, since it uses less digits than its factorization.

385142257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43022.

The product of its digits is 67200, while the sum is 37.

The square root of 385142257 is about 19625.0415795738. The cubic root of 385142257 is about 727.5682246492.

The spelling of 385142257 in words is "three hundred eighty-five million, one hundred forty-two thousand, two hundred fifty-seven".