42503281 has 8 divisors (see below), whose sum is σ = 45329760. Its totient is φ = 39713088.

The previous prime is 42503273. The next prime is 42503309. The reversal of 42503281 is 18230524.

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

It is not a de Polignac number, because 42503281 - 2³ = 42503273 is a prime.

It is a super-2 number, since 2×42503281² = 3613057791529922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42503261) 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, 6631 + ... + 11356.

It is an arithmetic number, because the mean of its divisors is an integer number (5666220).

Almost surely, 2^42503281 is an apocalyptic number.

It is an amenable number.

42503281 is a deficient number, since it is larger than the sum of its proper divisors (2826479).

42503281 is a wasteful number, since it uses less digits than its factorization.

42503281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18143.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 42503281 is about 6519.4540415590. The cubic root of 42503281 is about 348.9855824456.

The spelling of 42503281 in words is "forty-two million, five hundred three thousand, two hundred eighty-one".