42810731 has 4 divisors (see below), whose sum is σ = 43203600. Its totient is φ = 42417864.

The previous prime is 42810701. The next prime is 42810737. The reversal of 42810731 is 13701824.

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 42810731 - 2²² = 38616427 is a prime.

It is a super-2 number, since 2×42810731² = 3665517377508722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42810731.

It is not an unprimeable number, because it can be changed into a prime (42810737) 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, 196271 + ... + 196488.

It is an arithmetic number, because the mean of its divisors is an integer number (10800900).

Almost surely, 2^42810731 is an apocalyptic number.

42810731 is a deficient number, since it is larger than the sum of its proper divisors (392869).

42810731 is a wasteful number, since it uses less digits than its factorization.

42810731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392868.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 42810731 is about 6542.9909827234. The cubic root of 42810731 is about 349.8250309128.

The spelling of 42810731 in words is "forty-two million, eight hundred ten thousand, seven hundred thirty-one".