42550000 has 120 divisors (see below), whose sum is σ = 110430432. Its totient is φ = 15840000.

The previous prime is 42549973. The next prime is 42550007. The reversal of 42550000 is 5524.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42550007) 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, 1149982 + ... + 1150018.

Almost surely, 2^42550000 is an apocalyptic number.

42550000 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 42550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55215216).

42550000 is an abundant number, since it is smaller than the sum of its proper divisors (67880432).

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

42550000 is an equidigital number, since it uses as much as digits as its factorization.

42550000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 42550000 is about 6523.0361029202. The cubic root of 42550000 is about 349.1134022820.

Adding to 42550000 its reverse (5524), we get a palindrome (42555524).

The spelling of 42550000 in words is "forty-two million, five hundred fifty thousand".