42050781 has 12 divisors (see below), whose sum is σ = 63937120. Its totient is φ = 26558280.

The previous prime is 42050779. The next prime is 42050791. The reversal of 42050781 is 18705024.

It is not a de Polignac number, because 42050781 - 2¹ = 42050779 is a prime.

It is a super-2 number, since 2×42050781² = 3536536365419922, 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 (42050731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122785 + ... + 123126.

Almost surely, 2^42050781 is an apocalyptic number.

It is an amenable number.

42050781 is a deficient number, since it is larger than the sum of its proper divisors (21886339).

42050781 is a wasteful number, since it uses less digits than its factorization.

42050781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245936 (or 245933 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 42050781 is about 6484.6573540936. The cubic root of 42050781 is about 347.7427002161.

The spelling of 42050781 in words is "forty-two million, fifty thousand, seven hundred eighty-one".