42540047 has 16 divisors (see below), whose sum is σ = 48095232. Its totient is φ = 37285920.

The previous prime is 42540037. The next prime is 42540059. The reversal of 42540047 is 74004524.

It is a cyclic number.

It is not a de Polignac number, because 42540047 - 2¹⁰ = 42539023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42539998 and 42540025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540037) 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 15 ways as a sum of consecutive naturals, for example, 51278 + ... + 52100.

It is an arithmetic number, because the mean of its divisors is an integer number (3005952).

Almost surely, 2^42540047 is an apocalyptic number.

42540047 is a deficient number, since it is larger than the sum of its proper divisors (5555185).

42540047 is a wasteful number, since it uses less digits than its factorization.

42540047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 42540047 is about 6522.2731466874. The cubic root of 42540047 is about 349.0861794331.

The spelling of 42540047 in words is "forty-two million, five hundred forty thousand, forty-seven".