42489981 has 32 divisors (see below), whose sum is σ = 65197440. Its totient is φ = 27331200.

The previous prime is 42489943. The next prime is 42489983. The reversal of 42489981 is 18998424.

It is not a de Polignac number, because 42489981 - 2⁶ = 42489917 is a prime.

It is a super-2 number, since 2×42489981² = 3610796970760722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42489983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144871 + ... + 145163.

It is an arithmetic number, because the mean of its divisors is an integer number (2037420).

Almost surely, 2^42489981 is an apocalyptic number.

42489981 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42489981 is a deficient number, since it is larger than the sum of its proper divisors (22707459).

42489981 is a wasteful number, since it uses less digits than its factorization.

42489981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 468 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 42489981 is about 6518.4339376878. The cubic root of 42489981 is about 348.9491774720.

The spelling of 42489981 in words is "forty-two million, four hundred eighty-nine thousand, nine hundred eighty-one".