40311221 has 8 divisors (see below), whose sum is σ = 40895064. Its totient is φ = 39731200.

The previous prime is 40311211. The next prime is 40311239. The reversal of 40311221 is 12211304.

40311221 = 4489² + 4490².

It can be written as a sum of positive squares in 4 ways, for example, as 20160100 + 20151121 = 4490^2 + 4489^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40311221 - 2¹⁰ = 40310197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40311196 and 40311205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40311211) 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, 25181 + ... + 26733.

It is an arithmetic number, because the mean of its divisors is an integer number (5111883).

Almost surely, 2^40311221 is an apocalyptic number.

40311221 is the 4490-th centered square number.

It is an amenable number.

40311221 is a deficient number, since it is larger than the sum of its proper divisors (583843).

40311221 is a wasteful number, since it uses less digits than its factorization.

40311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 40311221 is about 6349.1118276496. Note that the first 3 decimals coincide. The cubic root of 40311221 is about 342.8798662436.

Adding to 40311221 its reverse (12211304), we get a palindrome (52522525).

The spelling of 40311221 in words is "forty million, three hundred eleven thousand, two hundred twenty-one".