42420340 has 12 divisors (see below), whose sum is σ = 89082756. Its totient is φ = 16968128.

The previous prime is 42420311. The next prime is 42420377. The reversal of 42420340 is 4302424.

It can be written as a sum of positive squares in 2 ways, for example, as 6492304 + 35928036 = 2548^2 + 5994^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1060489 + ... + 1060528.

It is an arithmetic number, because the mean of its divisors is an integer number (7423563).

Almost surely, 2^42420340 is an apocalyptic number.

It is an amenable number.

42420340 is an abundant number, since it is smaller than the sum of its proper divisors (46662416).

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

42420340 is a wasteful number, since it uses less digits than its factorization.

42420340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121026 (or 2121024 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 42420340 is about 6513.0898965084. The cubic root of 42420340 is about 348.7584308715.

Adding to 42420340 its reverse (4302424), we get a palindrome (46722764).

The spelling of 42420340 in words is "forty-two million, four hundred twenty thousand, three hundred forty".