42406281 has 8 divisors (see below), whose sum is σ = 62824160. Its totient is φ = 28270836.

The previous prime is 42406261. The next prime is 42406289. The reversal of 42406281 is 18260424.

It is not a de Polignac number, because 42406281 - 2¹⁹ = 41881993 is a prime.

It is a super-2 number, since 2×42406281² = 3596585336501922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1570603 = 42406281 / (4 + 2 + 4 + 0 + 6 + 2 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42406289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785275 + ... + 785328.

It is an arithmetic number, because the mean of its divisors is an integer number (7853020).

Almost surely, 2^42406281 is an apocalyptic number.

It is an amenable number.

42406281 is a deficient number, since it is larger than the sum of its proper divisors (20417879).

42406281 is a wasteful number, since it uses less digits than its factorization.

42406281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570612 (or 1570606 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 42406281 is about 6512.0105190333. The cubic root of 42406281 is about 348.7198979684.

The spelling of 42406281 in words is "forty-two million, four hundred six thousand, two hundred eighty-one".