40443381 has 40 divisors (see below), whose sum is σ = 69405600. Its totient is φ = 23211360.

The previous prime is 40443353. The next prime is 40443383. The reversal of 40443381 is 18334404.

It is not a de Polignac number, because 40443381 - 2⁶ = 40443317 is a prime.

It is a super-2 number, since 2×40443381² = 3271334133422322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40443383) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15735 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (1735140).

Almost surely, 2^40443381 is an apocalyptic number.

It is an amenable number.

40443381 is a deficient number, since it is larger than the sum of its proper divisors (28962219).

40443381 is a wasteful number, since it uses less digits than its factorization.

40443381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431 (or 2422 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 40443381 is about 6359.5110661119. The cubic root of 40443381 is about 343.2541670824.

Adding to 40443381 its reverse (18334404), we get a palindrome (58777785).

The spelling of 40443381 in words is "forty million, four hundred forty-three thousand, three hundred eighty-one".