42420520 has 16 divisors (see below), whose sum is σ = 95446260. Its totient is φ = 16968192.

The previous prime is 42420509. The next prime is 42420529. The reversal of 42420520 is 2502424.

It can be written as a sum of positive squares in 2 ways, for example, as 36650916 + 5769604 = 6054^2 + 2402^2 .

It is not an unprimeable number, because it can be changed into a prime (42420529) 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, 530217 + ... + 530296.

Almost surely, 2^42420520 is an apocalyptic number.

42420520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42420520 is an abundant number, since it is smaller than the sum of its proper divisors (53025740).

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

42420520 is a wasteful number, since it uses less digits than its factorization.

42420520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060524 (or 1060520 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 42420520 is about 6513.1037148198. The cubic root of 42420520 is about 348.7589241602.

Adding to 42420520 its reverse (2502424), we get a palindrome (44922944).

The spelling of 42420520 in words is "forty-two million, four hundred twenty thousand, five hundred twenty".