42660731 has 4 divisors (see below), whose sum is σ = 42700512. Its totient is φ = 42620952.

The previous prime is 42660727. The next prime is 42660733. The reversal of 42660731 is 13706624.

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

It is a cyclic number.

It is not a de Polignac number, because 42660731 - 2² = 42660727 is a prime.

It is a super-2 number, since 2×42660731² = 3639875938908722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42660694 and 42660703.

It is not an unprimeable number, because it can be changed into a prime (42660733) 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, 18236 + ... + 20441.

It is an arithmetic number, because the mean of its divisors is an integer number (10675128).

Almost surely, 2^42660731 is an apocalyptic number.

42660731 is a deficient number, since it is larger than the sum of its proper divisors (39781).

42660731 is a wasteful number, since it uses less digits than its factorization.

42660731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39780.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 42660731 is about 6531.5182767868. The cubic root of 42660731 is about 349.4159811354.

The spelling of 42660731 in words is "forty-two million, six hundred sixty thousand, seven hundred thirty-one".