42555949 has 4 divisors (see below), whose sum is σ = 42827164. Its totient is φ = 42284736.

The previous prime is 42555941. The next prime is 42555959. The reversal of 42555949 is 94955524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16362025 + 26193924 = 4045^2 + 5118^2 .

It is a cyclic number.

It is not a de Polignac number, because 42555949 - 2³ = 42555941 is a prime.

It is a super-2 number, since 2×42555949² = 3622017590581202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42555941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135372 + ... + 135685.

It is an arithmetic number, because the mean of its divisors is an integer number (10706791).

Almost surely, 2^42555949 is an apocalyptic number.

It is an amenable number.

42555949 is a deficient number, since it is larger than the sum of its proper divisors (271215).

42555949 is a wasteful number, since it uses less digits than its factorization.

42555949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271214.

The product of its digits is 324000, while the sum is 43.

The square root of 42555949 is about 6523.4920862986. The cubic root of 42555949 is about 349.1296716031.

The spelling of 42555949 in words is "forty-two million, five hundred fifty-five thousand, nine hundred forty-nine".