409881381 has 32 divisors (see below), whose sum is σ = 674623488. Its totient is φ = 215559360.

The previous prime is 409881379. The next prime is 409881391. The reversal of 409881381 is 183188904.

It is not a de Polignac number, because 409881381 - 2¹ = 409881379 is a prime.

It is a super-2 number, since 2×409881381² = 336005492980934322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409881371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98146 + ... + 102236.

It is an arithmetic number, because the mean of its divisors is an integer number (21081984).

Almost surely, 2^409881381 is an apocalyptic number.

It is an amenable number.

409881381 is a deficient number, since it is larger than the sum of its proper divisors (264742107).

409881381 is a wasteful number, since it uses less digits than its factorization.

409881381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 409881381 is about 20245.5274320033. The cubic root of 409881381 is about 742.8242336841.

The spelling of 409881381 in words is "four hundred nine million, eight hundred eighty-one thousand, three hundred eighty-one".