42909312 has 64 divisors (see below), whose sum is σ = 114982560. Its totient is φ = 14177280.

The previous prime is 42909311. The next prime is 42909323. The reversal of 42909312 is 21390924.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 42909312.

It is not an unprimeable number, because it can be changed into a prime (42909311) 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, 49878 + ... + 50730.

Almost surely, 2^42909312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42909312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57491280).

42909312 is an abundant number, since it is smaller than the sum of its proper divisors (72073248).

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

42909312 is a wasteful number, since it uses less digits than its factorization.

42909312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 42909312 is about 6550.5199793604. The cubic root of 42909312 is about 350.0933410912.

The spelling of 42909312 in words is "forty-two million, nine hundred nine thousand, three hundred twelve".