42495978 has 64 divisors (see below), whose sum is σ = 101449728. Its totient is φ = 11612160.

The previous prime is 42495977. The next prime is 42495979. The reversal of 42495978 is 87959424.

It is an interprime number because it is at equal distance from previous prime (42495977) and next prime (42495979).

It is not an unprimeable number, because it can be changed into a prime (42495977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165226 + ... + 165482.

It is an arithmetic number, because the mean of its divisors is an integer number (1585152).

Almost surely, 2^42495978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42495978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50724864).

42495978 is an abundant number, since it is smaller than the sum of its proper divisors (58953750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42495978 is a wasteful number, since it uses less digits than its factorization.

42495978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its digits is 725760, while the sum is 48.

The square root of 42495978 is about 6518.8939245857. The cubic root of 42495978 is about 348.9655934970.

The spelling of 42495978 in words is "forty-two million, four hundred ninety-five thousand, nine hundred seventy-eight".