42007731 has 16 divisors (see below), whose sum is σ = 59520384. Its totient is φ = 26262144.

The previous prime is 42007723. The next prime is 42007741. The reversal of 42007731 is 13770024.

42007731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42007731 - 2³ = 42007723 is a prime.

It is a super-2 number, since 2×42007731² = 3529298927536722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42007741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14316 + ... + 16998.

It is an arithmetic number, because the mean of its divisors is an integer number (3720024).

Almost surely, 2^42007731 is an apocalyptic number.

42007731 is a deficient number, since it is larger than the sum of its proper divisors (17512653).

42007731 is a wasteful number, since it uses less digits than its factorization.

42007731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3010.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 42007731 is about 6481.3371305619. The cubic root of 42007731 is about 347.6239910865.

Adding to 42007731 its reverse (13770024), we get a palindrome (55777755).

The spelling of 42007731 in words is "forty-two million, seven thousand, seven hundred thirty-one".