42921489 has 16 divisors (see below), whose sum is σ = 61789952. Its totient is φ = 26345088.

The previous prime is 42921457. The next prime is 42921509. The reversal of 42921489 is 98412924.

42921489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42921489 - 2⁵ = 42921457 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42920489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16869 + ... + 19245.

It is an arithmetic number, because the mean of its divisors is an integer number (3861872).

Almost surely, 2^42921489 is an apocalyptic number.

It is an amenable number.

42921489 is a deficient number, since it is larger than the sum of its proper divisors (18868463).

42921489 is a wasteful number, since it uses less digits than its factorization.

42921489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856.

The product of its digits is 41472, while the sum is 39.

The square root of 42921489 is about 6551.4493816254. The cubic root of 42921489 is about 350.1264549866.

The spelling of 42921489 in words is "forty-two million, nine hundred twenty-one thousand, four hundred eighty-nine".