42031800 has 144 divisors (see below), whose sum is σ = 148707000. Its totient is φ = 10609920.

The previous prime is 42031799. The next prime is 42031807. The reversal of 42031800 is 813024.

It is a happy number.

It is a super-2 number, since 2×42031800² = 3533344422480000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42031807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33586 + ... + 34814.

Almost surely, 2^42031800 is an apocalyptic number.

42031800 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 42031800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74353500).

42031800 is an abundant number, since it is smaller than the sum of its proper divisors (106675200).

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

42031800 is a wasteful number, since it uses less digits than its factorization.

42031800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 42031800 is about 6483.1936574500. The cubic root of 42031800 is about 347.6903706485.

Adding to 42031800 its reverse (813024), we get a palindrome (42844824).

The spelling of 42031800 in words is "forty-two million, thirty-one thousand, eight hundred".