42697781 has 8 divisors (see below), whose sum is σ = 49182720. Its totient is φ = 36309168.

The previous prime is 42697771. The next prime is 42697789. The reversal of 42697781 is 18779624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42697781 - 2¹⁸ = 42435637 is a prime.

It is a super-2 number, since 2×42697781² = 3646201004647922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42697789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23126 + ... + 24903.

It is an arithmetic number, because the mean of its divisors is an integer number (6147840).

Almost surely, 2^42697781 is an apocalyptic number.

It is an amenable number.

42697781 is a deficient number, since it is larger than the sum of its proper divisors (6484939).

42697781 is a wasteful number, since it uses less digits than its factorization.

42697781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48163.

The product of its digits is 169344, while the sum is 44.

The square root of 42697781 is about 6534.3539083830. The cubic root of 42697781 is about 349.5171054861.

The spelling of 42697781 in words is "forty-two million, six hundred ninety-seven thousand, seven hundred eighty-one".