40143381 has 8 divisors (see below), whose sum is σ = 54769440. Its totient is φ = 26139792.

The previous prime is 40143377. The next prime is 40143391. The reversal of 40143381 is 18334104.

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

It is not a de Polignac number, because 40143381 - 2² = 40143377 is a prime.

It is a super-2 number, since 2×40143381² = 3222982076222322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40143391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155466 + ... + 155723.

It is an arithmetic number, because the mean of its divisors is an integer number (6846180).

Almost surely, 2^40143381 is an apocalyptic number.

It is an amenable number.

40143381 is a deficient number, since it is larger than the sum of its proper divisors (14626059).

40143381 is a wasteful number, since it uses less digits than its factorization.

40143381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311235.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 40143381 is about 6335.8804439478. The cubic root of 40143381 is about 342.4033321591.

Adding to 40143381 its reverse (18334104), we get a palindrome (58477485).

The spelling of 40143381 in words is "forty million, one hundred forty-three thousand, three hundred eighty-one".