407181 has 4 divisors (see below), whose sum is σ = 542912. Its totient is φ = 271452.

The previous prime is 407179. The next prime is 407191. The reversal of 407181 is 181704.

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 407181 - 2¹ = 407179 is a prime.

It is a super-2 number, since 2×407181² = 331592733522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

407181 is a lucky number.

It is a plaindrome in base 12 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (407191) 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, 67861 + ... + 67866.

It is an arithmetic number, because the mean of its divisors is an integer number (135728).

2⁴⁰⁷¹⁸¹ is an apocalyptic number.

It is an amenable number.

407181 is a deficient number, since it is larger than the sum of its proper divisors (135731).

407181 is a wasteful number, since it uses less digits than its factorization.

407181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135730.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 407181 is about 638.1073577385. The cubic root of 407181 is about 74.1189346256.

Adding to 407181 its reverse (181704), we get a palindrome (588885).

The spelling of 407181 in words is "four hundred seven thousand, one hundred eighty-one".