42947808 has 96 divisors (see below), whose sum is σ = 120185856. Its totient is φ = 13398528.

The previous prime is 42947777. The next prime is 42947813. The reversal of 42947808 is 80874924.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 42947808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116841 + ... + 117207.

It is an arithmetic number, because the mean of its divisors is an integer number (1251936).

Almost surely, 2^42947808 is an apocalyptic number.

42947808 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42947808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60092928).

42947808 is an abundant number, since it is smaller than the sum of its proper divisors (77238048).

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

42947808 is a wasteful number, since it uses less digits than its factorization.

42947808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 42947808 is about 6553.4577132991. The cubic root of 42947808 is about 350.1980049686.

The spelling of 42947808 in words is "forty-two million, nine hundred forty-seven thousand, eight hundred eight".