30142857 has 8 divisors (see below), whose sum is σ = 41937984. Its totient is φ = 19221488.

The previous prime is 30142843. The next prime is 30142859. The reversal of 30142857 is 75824103.

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 30142857 - 2¹¹ = 30140809 is a prime.

30142857 is a modest number, since divided by 142857 gives 30 as remainder.

It is not an unprimeable number, because it can be changed into a prime (30142859) 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, 218358 + ... + 218495.

It is an arithmetic number, because the mean of its divisors is an integer number (5242248).

Almost surely, 2^30142857 is an apocalyptic number.

It is an amenable number.

30142857 is a deficient number, since it is larger than the sum of its proper divisors (11795127).

30142857 is a wasteful number, since it uses less digits than its factorization.

30142857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436879.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 30142857 is about 5490.2510871544. The cubic root of 30142857 is about 311.2156808018.

The spelling of 30142857 in words is "thirty million, one hundred forty-two thousand, eight hundred fifty-seven".