40548821 has 2 divisors, whose sum is σ = 40548822. Its totient is φ = 40548820.

The previous prime is 40548779. The next prime is 40548829. The reversal of 40548821 is 12884504.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26635921 + 13912900 = 5161^2 + 3730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40548821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40548829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20274410 + 20274411.

It is an arithmetic number, because the mean of its divisors is an integer number (20274411).

Almost surely, 2^40548821 is an apocalyptic number.

It is an amenable number.

40548821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40548821 is an equidigital number, since it uses as much as digits as its factorization.

40548821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 40548821 is about 6367.7956154387. The cubic root of 40548821 is about 343.5522077116.

The spelling of 40548821 in words is "forty million, five hundred forty-eight thousand, eight hundred twenty-one".