42540137 has 4 divisors (see below), whose sum is σ = 45042516. Its totient is φ = 40037760.

The previous prime is 42540101. The next prime is 42540139. The reversal of 42540137 is 73104524.

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 35271721 + 7268416 = 5939^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 42540137 - 2¹⁰ = 42539113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42540139) 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 3 ways as a sum of consecutive naturals, for example, 1251164 + ... + 1251197.

It is an arithmetic number, because the mean of its divisors is an integer number (11260629).

Almost surely, 2^42540137 is an apocalyptic number.

It is an amenable number.

42540137 is a deficient number, since it is larger than the sum of its proper divisors (2502379).

42540137 is a wasteful number, since it uses less digits than its factorization.

42540137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502378.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 42540137 is about 6522.2800461188. The cubic root of 42540137 is about 349.0864256147.

The spelling of 42540137 in words is "forty-two million, five hundred forty thousand, one hundred thirty-seven".