42140155 has 4 divisors (see below), whose sum is σ = 50568192. Its totient is φ = 33712120.

The previous prime is 42140123. The next prime is 42140167. The reversal of 42140155 is 55104124.

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

It is not a de Polignac number, because 42140155 - 2⁵ = 42140123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4214011 + ... + 4214020.

It is an arithmetic number, because the mean of its divisors is an integer number (12642048).

Almost surely, 2^42140155 is an apocalyptic number.

42140155 is a deficient number, since it is larger than the sum of its proper divisors (8428037).

42140155 is an equidigital number, since it uses as much as digits as its factorization.

42140155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8428036.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 42140155 is about 6491.5448854645. The cubic root of 42140155 is about 347.9888879836.

Adding to 42140155 its reverse (55104124), we get a palindrome (97244279).

The spelling of 42140155 in words is "forty-two million, one hundred forty thousand, one hundred fifty-five".