42091992 has 96 divisors (see below), whose sum is σ = 124254000. Its totient is φ = 12821760.

The previous prime is 42091967. The next prime is 42091993. The reversal of 42091992 is 29919024.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42091993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39142 + ... + 40202.

Almost surely, 2^42091992 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 42091992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62127000).

42091992 is an abundant number, since it is smaller than the sum of its proper divisors (82162008).

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

42091992 is a wasteful number, since it uses less digits than its factorization.

42091992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1114 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 42091992 is about 6487.8341532441. The cubic root of 42091992 is about 347.8562624781.

The spelling of 42091992 in words is "forty-two million, ninety-one thousand, nine hundred ninety-two".