42220240 has 20 divisors (see below), whose sum is σ = 98162244. Its totient is φ = 16888064.

The previous prime is 42220237. The next prime is 42220247. The reversal of 42220240 is 4202224.

It can be written as a sum of positive squares in 2 ways, for example, as 8904256 + 33315984 = 2984^2 + 5772^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 (42220247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263797 + ... + 263956.

Almost surely, 2^42220240 is an apocalyptic number.

42220240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42220240 is an abundant number, since it is smaller than the sum of its proper divisors (55942004).

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

42220240 is a wasteful number, since it uses less digits than its factorization.

42220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527766 (or 527760 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42220240 is about 6497.7103659674. The cubic root of 42220240 is about 348.2091929351.

Adding to 42220240 its reverse (4202224), we get a palindrome (46422464).

The spelling of 42220240 in words is "forty-two million, two hundred twenty thousand, two hundred forty".