42945878 has 4 divisors (see below), whose sum is σ = 64418820. Its totient is φ = 21472938.

The previous prime is 42945869. The next prime is 42945883. The reversal of 42945878 is 87854924.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736468 + ... + 10736471.

It is an arithmetic number, because the mean of its divisors is an integer number (16104705).

Almost surely, 2^42945878 is an apocalyptic number.

42945878 is a deficient number, since it is larger than the sum of its proper divisors (21472942).

42945878 is a wasteful number, since it uses less digits than its factorization.

42945878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21472941.

The product of its digits is 645120, while the sum is 47.

The square root of 42945878 is about 6553.3104611334. The cubic root of 42945878 is about 350.1927591264.

The spelling of 42945878 in words is "forty-two million, nine hundred forty-five thousand, eight hundred seventy-eight".