42403220 has 36 divisors (see below), whose sum is σ = 92259804. Its totient is φ = 16369920.

The previous prime is 42403217. The next prime is 42403223. The reversal of 42403220 is 2230424.

It is an interprime number because it is at equal distance from previous prime (42403217) and next prime (42403223).

It can be written as a sum of positive squares in 6 ways, for example, as 7214596 + 35188624 = 2686^2 + 5932^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42403223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15560 + ... + 18080.

Almost surely, 2^42403220 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 42403220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46129902).

42403220 is an abundant number, since it is smaller than the sum of its proper divisors (49856584).

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

42403220 is a wasteful number, since it uses less digits than its factorization.

42403220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 42403220 is about 6511.7754875303. The cubic root of 42403220 is about 348.7115072515.

Adding to 42403220 its reverse (2230424), we get a palindrome (44633644).

The spelling of 42403220 in words is "forty-two million, four hundred three thousand, two hundred twenty".