440402381 has 4 divisors (see below), whose sum is σ = 455588700. Its totient is φ = 425216064.

The previous prime is 440402377. The next prime is 440402383. The reversal of 440402381 is 183204044.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259499881 + 180902500 = 16109^2 + 13450^2 .

It is a cyclic number.

It is not a de Polignac number, because 440402381 - 2² = 440402377 is a prime.

It is a super-2 number, since 2×440402381² = 387908514380938322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 440402381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440402383) 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, 7593116 + ... + 7593173.

It is an arithmetic number, because the mean of its divisors is an integer number (113897175).

Almost surely, 2^440402381 is an apocalyptic number.

It is an amenable number.

440402381 is a deficient number, since it is larger than the sum of its proper divisors (15186319).

440402381 is a wasteful number, since it uses less digits than its factorization.

440402381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15186318.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 440402381 is about 20985.7661523233. The cubic root of 440402381 is about 760.8222754224.

The spelling of 440402381 in words is "four hundred forty million, four hundred two thousand, three hundred eighty-one".