42040000 has 70 divisors (see below), whose sum is σ = 104344724. Its totient is φ = 16800000.

The previous prime is 42039967. The next prime is 42040007. The reversal of 42040000 is 4024.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (42040007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39475 + ... + 40525.

Almost surely, 2^42040000 is an apocalyptic number.

42040000 is a gapful number since it is divisible by the number (40) 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 42040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52172362).

42040000 is an abundant number, since it is smaller than the sum of its proper divisors (62304724).

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

42040000 is an equidigital number, since it uses as much as digits as its factorization.

42040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 42040000 is about 6483.8260309789. The cubic root of 42040000 is about 347.7129795276.

Adding to 42040000 its reverse (4024), we get a palindrome (42044024).

The spelling of 42040000 in words is "forty-two million, forty thousand", and thus it is an eban number.