42140181 has 4 divisors (see below), whose sum is σ = 56186912. Its totient is φ = 28093452.

The previous prime is 42140177. The next prime is 42140183. The reversal of 42140181 is 18104124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42140181 - 2² = 42140177 is a prime.

It is a super-2 number, since 2×42140181² = 3551589709425522, 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 (42140183) 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, 7023361 + ... + 7023366.

It is an arithmetic number, because the mean of its divisors is an integer number (14046728).

Almost surely, 2^42140181 is an apocalyptic number.

It is an amenable number.

42140181 is a deficient number, since it is larger than the sum of its proper divisors (14046731).

42140181 is a wasteful number, since it uses less digits than its factorization.

42140181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14046730.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 42140181 is about 6491.5468880691. The cubic root of 42140181 is about 347.9889595520.

The spelling of 42140181 in words is "forty-two million, one hundred forty thousand, one hundred eighty-one".