42540049 has 4 divisors (see below), whose sum is σ = 42570036. Its totient is φ = 42510064.

The previous prime is 42540037. The next prime is 42540059. The reversal of 42540049 is 94004524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30603024 + 11937025 = 5532^2 + 3455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42540049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42539999 and 42540026.

It is not an unprimeable number, because it can be changed into a prime (42540019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12754 + ... + 15739.

It is an arithmetic number, because the mean of its divisors is an integer number (10642509).

Almost surely, 2^42540049 is an apocalyptic number.

It is an amenable number.

42540049 is a deficient number, since it is larger than the sum of its proper divisors (29987).

42540049 is a wasteful number, since it uses less digits than its factorization.

42540049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29986.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 42540049 is about 6522.2733000082. The cubic root of 42540049 is about 349.0861849038.

The spelling of 42540049 in words is "forty-two million, five hundred forty thousand, forty-nine".