42102857 has 4 divisors (see below), whose sum is σ = 43933440. Its totient is φ = 40272276.

The previous prime is 42102839. The next prime is 42102887. The reversal of 42102857 is 75820124.

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.

It is a cyclic number.

It is not a de Polignac number, because 42102857 - 2⁶ = 42102793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42102887) 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, 915257 + ... + 915302.

It is an arithmetic number, because the mean of its divisors is an integer number (10983360).

Almost surely, 2^42102857 is an apocalyptic number.

It is an amenable number.

42102857 is a deficient number, since it is larger than the sum of its proper divisors (1830583).

42102857 is a wasteful number, since it uses less digits than its factorization.

42102857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830582.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 42102857 is about 6488.6714356639. The cubic root of 42102857 is about 347.8861900484.

The spelling of 42102857 in words is "forty-two million, one hundred two thousand, eight hundred fifty-seven".