406261881 has 6 divisors (see below), whose sum is σ = 586822730. Its totient is φ = 270841248.

The previous prime is 406261879. The next prime is 406261901. The reversal of 406261881 is 188162604.

It can be written as a sum of positive squares in only one way, i.e., 404613225 + 1648656 = 20115^2 + 1284^2 .

It is not a de Polignac number, because 406261881 - 2¹ = 406261879 is a prime.

It is a super-2 number, since 2×406261881² = 330097431907316322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406261831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22570096 + ... + 22570113.

Almost surely, 2^406261881 is an apocalyptic number.

It is an amenable number.

406261881 is a deficient number, since it is larger than the sum of its proper divisors (180560849).

406261881 is a wasteful number, since it uses less digits than its factorization.

406261881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45140215 (or 45140212 counting only the distinct ones).

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

The square root of 406261881 is about 20155.9390999278. The cubic root of 406261881 is about 740.6312370142.

The spelling of 406261881 in words is "four hundred six million, two hundred sixty-one thousand, eight hundred eighty-one".