42549861 has 8 divisors (see below), whose sum is σ = 60070464. Its totient is φ = 26697920.

The previous prime is 42549853. The next prime is 42549877. The reversal of 42549861 is 16894524.

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

It is a cyclic number.

It is not a de Polignac number, because 42549861 - 2³ = 42549853 is a prime.

It is a super-2 number, since 2×42549861² = 3620981342238642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42549821) 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, 417105 + ... + 417206.

It is an arithmetic number, because the mean of its divisors is an integer number (7508808).

Almost surely, 2^42549861 is an apocalyptic number.

It is an amenable number.

42549861 is a deficient number, since it is larger than the sum of its proper divisors (17520603).

42549861 is a wasteful number, since it uses less digits than its factorization.

42549861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834331.

The product of its digits is 69120, while the sum is 39.

The square root of 42549861 is about 6523.0254483637. The cubic root of 42549861 is about 349.1130221267.

The spelling of 42549861 in words is "forty-two million, five hundred forty-nine thousand, eight hundred sixty-one".