42491878 has 16 divisors (see below), whose sum is σ = 74881296. Its totient is φ = 17828640.

The previous prime is 42491861. The next prime is 42491881. The reversal of 42491878 is 87819424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74001 + ... + 74572.

It is an arithmetic number, because the mean of its divisors is an integer number (4680081).

Almost surely, 2^42491878 is an apocalyptic number.

42491878 is a deficient number, since it is larger than the sum of its proper divisors (32389418).

42491878 is a wasteful number, since it uses less digits than its factorization.

42491878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148599.

The product of its digits is 129024, while the sum is 43.

The square root of 42491878 is about 6518.5794464745. The cubic root of 42491878 is about 348.9543704353.

The spelling of 42491878 in words is "forty-two million, four hundred ninety-one thousand, eight hundred seventy-eight".