42240137 has 4 divisors (see below), whose sum is σ = 42345876. Its totient is φ = 42134400.

The previous prime is 42240131. The next prime is 42240161. The reversal of 42240137 is 73104224.

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 41744521 + 495616 = 6461^2 + 704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42240137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42240131) 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, 52268 + ... + 53069.

It is an arithmetic number, because the mean of its divisors is an integer number (10586469).

Almost surely, 2^42240137 is an apocalyptic number.

It is an amenable number.

42240137 is a deficient number, since it is larger than the sum of its proper divisors (105739).

42240137 is a wasteful number, since it uses less digits than its factorization.

42240137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105738.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 42240137 is about 6499.2412634091. The cubic root of 42240137 is about 348.2638841625.

The spelling of 42240137 in words is "forty-two million, two hundred forty thousand, one hundred thirty-seven".