42040389 has 16 divisors (see below), whose sum is σ = 58950144. Its totient is φ = 26598000.

The previous prime is 42040387. The next prime is 42040409. The reversal of 42040389 is 98304024.

It is a happy number.

It is not a de Polignac number, because 42040389 - 2¹ = 42040387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42040387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6714 + ... + 11364.

It is an arithmetic number, because the mean of its divisors is an integer number (3684384).

Almost surely, 2^42040389 is an apocalyptic number.

It is an amenable number.

42040389 is a deficient number, since it is larger than the sum of its proper divisors (16909755).

42040389 is a wasteful number, since it uses less digits than its factorization.

42040389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4808.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 42040389 is about 6483.8560286299. The cubic root of 42040389 is about 347.7140519977.

The spelling of 42040389 in words is "forty-two million, forty thousand, three hundred eighty-nine".