42705631 has 4 divisors (see below), whose sum is σ = 44083264. Its totient is φ = 41328000.

The previous prime is 42705623. The next prime is 42705667. The reversal of 42705631 is 13650724.

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 42705631 - 2³ = 42705623 is a prime.

It is a super-2 number, since 2×42705631² = 3647541838216322, 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 42705631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42705601) 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, 688770 + ... + 688831.

It is an arithmetic number, because the mean of its divisors is an integer number (11020816).

Almost surely, 2^42705631 is an apocalyptic number.

42705631 is a deficient number, since it is larger than the sum of its proper divisors (1377633).

42705631 is a wasteful number, since it uses less digits than its factorization.

42705631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377632.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 42705631 is about 6534.9545522521. The cubic root of 42705631 is about 349.5385237822.

The spelling of 42705631 in words is "forty-two million, seven hundred five thousand, six hundred thirty-one".