42731637 has 32 divisors (see below), whose sum is σ = 63748608. Its totient is φ = 25292736.

The previous prime is 42731603. The next prime is 42731657. The reversal of 42731637 is 73613724.

It is not a de Polignac number, because 42731637 - 2⁶ = 42731573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42731598 and 42731607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42731657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139038 + ... + 139344.

It is an arithmetic number, because the mean of its divisors is an integer number (1992144).

Almost surely, 2^42731637 is an apocalyptic number.

It is an amenable number.

42731637 is a deficient number, since it is larger than the sum of its proper divisors (21016971).

42731637 is a wasteful number, since it uses less digits than its factorization.

42731637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449.

The product of its digits is 21168, while the sum is 33.

The square root of 42731637 is about 6536.9440107745. The cubic root of 42731637 is about 349.6094609872.

The spelling of 42731637 in words is "forty-two million, seven hundred thirty-one thousand, six hundred thirty-seven".