40143321 has 6 divisors (see below), whose sum is σ = 57984810. Its totient is φ = 26762208.

The previous prime is 40143317. The next prime is 40143343. The reversal of 40143321 is 12334104.

It can be written as a sum of positive squares in only one way, i.e., 24651225 + 15492096 = 4965^2 + 3936^2 .

It is not a de Polignac number, because 40143321 - 2² = 40143317 is a prime.

It is a super-2 number, since 2×40143321² = 3222972441818082, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40143294 and 40143303.

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 5 ways as a sum of consecutive naturals, for example, 2230176 + ... + 2230193.

It is an arithmetic number, because the mean of its divisors is an integer number (9664135).

Almost surely, 2^40143321 is an apocalyptic number.

It is an amenable number.

40143321 is a deficient number, since it is larger than the sum of its proper divisors (17841489).

40143321 is a wasteful number, since it uses less digits than its factorization.

40143321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460375 (or 4460372 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 40143321 is about 6335.8757090082. The cubic root of 40143321 is about 342.4031615688.

Adding to 40143321 its reverse (12334104), we get a palindrome (52477425).

The spelling of 40143321 in words is "forty million, one hundred forty-three thousand, three hundred twenty-one".