406682181 has 16 divisors (see below), whose sum is σ = 612371520. Its totient is φ = 266675760.

The previous prime is 406682179. The next prime is 406682183. The reversal of 406682181 is 181286604.

It is an interprime number because it is at equal distance from previous prime (406682179) and next prime (406682183).

It is not a de Polignac number, because 406682181 - 2¹ = 406682179 is a prime.

It is a super-2 number, since 2×406682181² = 330780792685833522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406682183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121815 + ... + 125108.

It is an arithmetic number, because the mean of its divisors is an integer number (38273220).

Almost surely, 2^406682181 is an apocalyptic number.

It is an amenable number.

406682181 is a deficient number, since it is larger than the sum of its proper divisors (205689339).

406682181 is a wasteful number, since it uses less digits than its factorization.

406682181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246993 (or 246987 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 406682181 is about 20166.3626120329. The cubic root of 406682181 is about 740.8865567453.

It can be divided in two parts, 40668 and 2181, that added together give a square (42849 = 207²).

The spelling of 406682181 in words is "four hundred six million, six hundred eighty-two thousand, one hundred eighty-one".