42081237 has 24 divisors (see below), whose sum is σ = 69196608. Its totient is φ = 24393600.

The previous prime is 42081227. The next prime is 42081241. The reversal of 42081237 is 73218024.

42081237 is a `hidden beast` number, since 420 + 8 + 1 + 237 = 666.

It is not a de Polignac number, because 42081237 - 2¹² = 42077141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42081237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42081227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6964 + ... + 11517.

It is an arithmetic number, because the mean of its divisors is an integer number (2883192).

Almost surely, 2^42081237 is an apocalyptic number.

It is an amenable number.

42081237 is a deficient number, since it is larger than the sum of its proper divisors (27115371).

42081237 is a wasteful number, since it uses less digits than its factorization.

42081237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18521 (or 18518 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 42081237 is about 6487.0052412496. The cubic root of 42081237 is about 347.8266328295.

It can be divided in two parts, 4208 and 1237, that added together give a palindrome (5445).

The spelling of 42081237 in words is "forty-two million, eighty-one thousand, two hundred thirty-seven".