42878031 has 8 divisors (see below), whose sum is σ = 65337984. Its totient is φ = 24501720.

The previous prime is 42878027. The next prime is 42878039. The reversal of 42878031 is 13087824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42878031 - 2² = 42878027 is a prime.

It is a super-2 number, since 2×42878031² = 3677051084873922, which contains 22 as substring.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 42877983 and 42878001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42878039) 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, 1020885 + ... + 1020926.

It is an arithmetic number, because the mean of its divisors is an integer number (8167248).

Almost surely, 2^42878031 is an apocalyptic number.

42878031 is a deficient number, since it is larger than the sum of its proper divisors (22459953).

42878031 is a wasteful number, since it uses less digits than its factorization.

42878031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041821.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 42878031 is about 6548.1318709995. The cubic root of 42878031 is about 350.0082474247.

The spelling of 42878031 in words is "forty-two million, eight hundred seventy-eight thousand, thirty-one".