42037681 has 4 divisors (see below), whose sum is σ = 48043072. Its totient is φ = 36032292.

The previous prime is 42037679. The next prime is 42037691. The reversal of 42037681 is 18673024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42037681 - 2¹ = 42037679 is a prime.

It is a super-2 number, since 2×42037681² = 3534333247715522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42037621) 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, 3002685 + ... + 3002698.

It is an arithmetic number, because the mean of its divisors is an integer number (12010768).

Almost surely, 2^42037681 is an apocalyptic number.

It is an amenable number.

42037681 is a deficient number, since it is larger than the sum of its proper divisors (6005391).

42037681 is an equidigital number, since it uses as much as digits as its factorization.

42037681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6005390.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 42037681 is about 6483.6471989151. The cubic root of 42037681 is about 347.7065859245.

The spelling of 42037681 in words is "forty-two million, thirty-seven thousand, six hundred eighty-one".