440181381 has 8 divisors (see below), whose sum is σ = 588032800. Its totient is φ = 292892112.

The previous prime is 440181347. The next prime is 440181407. The reversal of 440181381 is 183181044.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 440181381 - 2⁶ = 440181317 is a prime.

It is a super-2 number, since 2×440181381² = 387519296358134322, which contains 22 as substring.

It is the 20981-st Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440181311) by changing a digit.

It is a nontrivial repunit in base 20980.

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 7 ways as a sum of consecutive naturals, for example, 138706 + ... + 141843.

It is an arithmetic number, because the mean of its divisors is an integer number (73504100).

Almost surely, 2^440181381 is an apocalyptic number.

It is an amenable number.

440181381 is a deficient number, since it is larger than the sum of its proper divisors (147851419).

440181381 is a wasteful number, since it uses less digits than its factorization.

440181381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281075.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 440181381 is about 20980.5000178737. The cubic root of 440181381 is about 760.6949904188.

The spelling of 440181381 in words is "four hundred forty million, one hundred eighty-one thousand, three hundred eighty-one".