42009512 has 8 divisors (see below), whose sum is σ = 78767850. Its totient is φ = 21004752.

The previous prime is 42009509. The next prime is 42009571. The reversal of 42009512 is 21590024.

It can be written as a sum of positive squares in only one way, i.e., 37283236 + 4726276 = 6106^2 + 2174^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625587 + ... + 2625602.

Almost surely, 2^42009512 is an apocalyptic number.

It is an amenable number.

42009512 is a deficient number, since it is larger than the sum of its proper divisors (36758338).

42009512 is a wasteful number, since it uses less digits than its factorization.

42009512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251195 (or 5251191 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 42009512 is about 6481.4745235941. The cubic root of 42009512 is about 347.6289037503.

Adding to 42009512 its reverse (21590024), we get a palindrome (63599536).

The spelling of 42009512 in words is "forty-two million, nine thousand, five hundred twelve".