42139863 has 6 divisors (see below), whose sum is σ = 60868704. Its totient is φ = 28093236.

The previous prime is 42139829. The next prime is 42139879. The reversal of 42139863 is 36893124.

It is not a de Polignac number, because 42139863 - 2⁹ = 42139351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42139063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2341095 + ... + 2341112.

It is an arithmetic number, because the mean of its divisors is an integer number (10144784).

Almost surely, 2^42139863 is an apocalyptic number.

42139863 is a deficient number, since it is larger than the sum of its proper divisors (18728841).

42139863 is a wasteful number, since it uses less digits than its factorization.

42139863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682213 (or 4682210 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 42139863 is about 6491.5223946313. The cubic root of 42139863 is about 347.9880842135.

The spelling of 42139863 in words is "forty-two million, one hundred thirty-nine thousand, eight hundred sixty-three".