42059781 has 6 divisors (see below), whose sum is σ = 60753030. Its totient is φ = 28039848.

The previous prime is 42059767. The next prime is 42059789. The reversal of 42059781 is 18795024.

It can be written as a sum of positive squares in only one way, i.e., 21538881 + 20520900 = 4641^2 + 4530^2 .

It is not a de Polignac number, because 42059781 - 2¹¹ = 42057733 is a prime.

It is a super-2 number, since 2×42059781² = 3538050355535922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42059789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2336646 + ... + 2336663.

It is an arithmetic number, because the mean of its divisors is an integer number (10125505).

Almost surely, 2^42059781 is an apocalyptic number.

It is an amenable number.

42059781 is a deficient number, since it is larger than the sum of its proper divisors (18693249).

42059781 is a wasteful number, since it uses less digits than its factorization.

42059781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4673315 (or 4673312 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 42059781 is about 6485.3512626534. The cubic root of 42059781 is about 347.7675072151.

The spelling of 42059781 in words is "forty-two million, fifty-nine thousand, seven hundred eighty-one".