42067731 has 4 divisors (see below), whose sum is σ = 56090312. Its totient is φ = 28045152.

The previous prime is 42067721. The next prime is 42067733. The reversal of 42067731 is 13776024.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42067731 - 2⁵ = 42067699 is a prime.

It is a super-2 number, since 2×42067731² = 3539387982976722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42067733) 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, 7011286 + ... + 7011291.

It is an arithmetic number, because the mean of its divisors is an integer number (14022578).

Almost surely, 2^42067731 is an apocalyptic number.

42067731 is a deficient number, since it is larger than the sum of its proper divisors (14022581).

42067731 is a wasteful number, since it uses less digits than its factorization.

42067731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14022580.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 42067731 is about 6485.9641534625. The cubic root of 42067731 is about 347.7894171208.

The spelling of 42067731 in words is "forty-two million, sixty-seven thousand, seven hundred thirty-one".