42009930 has 24 divisors (see below), whose sum is σ = 109226052. Its totient is φ = 11202624.

The previous prime is 42009923. The next prime is 42009959. The reversal of 42009930 is 3990024.

It can be written as a sum of positive squares in 2 ways, for example, as 40717161 + 1292769 = 6381^2 + 1137^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42009894 and 42009903.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233299 + ... + 233478.

Almost surely, 2^42009930 is an apocalyptic number.

42009930 is an abundant number, since it is smaller than the sum of its proper divisors (67216122).

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

42009930 is a wasteful number, since it uses less digits than its factorization.

42009930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466790 (or 466787 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 42009930 is about 6481.5067692628. The cubic root of 42009930 is about 347.6300567305.

Adding to 42009930 its reverse (3990024), we get a palindrome (45999954).

The spelling of 42009930 in words is "forty-two million, nine thousand, nine hundred thirty".