42501220 has 24 divisors (see below), whose sum is σ = 89523000. Its totient is φ = 16948992.

The previous prime is 42501209. The next prime is 42501253. The reversal of 42501220 is 2210524.

It can be written as a sum of positive squares in 4 ways, for example, as 3663396 + 38837824 = 1914^2 + 6232^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42501194 and 42501203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3936 + ... + 10024.

It is an arithmetic number, because the mean of its divisors is an integer number (3730125).

Almost surely, 2^42501220 is an apocalyptic number.

It is an amenable number.

42501220 is an abundant number, since it is smaller than the sum of its proper divisors (47021780).

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

42501220 is a wasteful number, since it uses less digits than its factorization.

42501220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447 (or 6445 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 42501220 is about 6519.2959742598. The cubic root of 42501220 is about 348.9799415406.

Adding to 42501220 its reverse (2210524), we get a palindrome (44711744).

The spelling of 42501220 in words is "forty-two million, five hundred one thousand, two hundred twenty".