42009155 has 8 divisors (see below), whose sum is σ = 52602912. Its totient is φ = 32146048.

The previous prime is 42009131. The next prime is 42009169. The reversal of 42009155 is 55190024.

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 42009155 - 2⁸ = 42008899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182534 + ... + 182763.

It is an arithmetic number, because the mean of its divisors is an integer number (6575364).

Almost surely, 2^42009155 is an apocalyptic number.

42009155 is a deficient number, since it is larger than the sum of its proper divisors (10593757).

42009155 is a wasteful number, since it uses less digits than its factorization.

42009155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365325.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 42009155 is about 6481.4469835061. The cubic root of 42009155 is about 347.6279190220.

Adding to 42009155 its reverse (55190024), we get a palindrome (97199179).

The spelling of 42009155 in words is "forty-two million, nine thousand, one hundred fifty-five".