42390549 has 12 divisors (see below), whose sum is σ = 61360000. Its totient is φ = 28200744.

The previous prime is 42390521. The next prime is 42390553. The reversal of 42390549 is 94509324.

42390549 is a `hidden beast` number, since 4 + 23 + 90 + 549 = 666.

It is not a de Polignac number, because 42390549 - 2⁹ = 42390037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42390559) 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 11 ways as a sum of consecutive naturals, for example, 229 + ... + 9210.

Almost surely, 2^42390549 is an apocalyptic number.

It is an amenable number.

42390549 is a deficient number, since it is larger than the sum of its proper divisors (18969451).

42390549 is a wasteful number, since it uses less digits than its factorization.

42390549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9944 (or 9941 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 42390549 is about 6510.8024851012. The cubic root of 42390549 is about 348.6767696090.

The spelling of 42390549 in words is "forty-two million, three hundred ninety thousand, five hundred forty-nine".