42420450 has 48 divisors (see below), whose sum is σ = 105618240. Its totient is φ = 11267520.

The previous prime is 42420439. The next prime is 42420451. The reversal of 42420450 is 5402424.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42420451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57987 + ... + 58713.

It is an arithmetic number, because the mean of its divisors is an integer number (2200380).

Almost surely, 2^42420450 is an apocalyptic number.

42420450 is an abundant number, since it is smaller than the sum of its proper divisors (63197790).

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

42420450 is a wasteful number, since it uses less digits than its factorization.

42420450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 42420450 is about 6513.0983410355. The cubic root of 42420450 is about 348.7587323259.

Adding to 42420450 its reverse (5402424), we get a palindrome (47822874).

The spelling of 42420450 in words is "forty-two million, four hundred twenty thousand, four hundred fifty".