40221557 has 2 divisors, whose sum is σ = 40221558. Its totient is φ = 40221556.

The previous prime is 40221529. The next prime is 40221563. The reversal of 40221557 is 75512204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34880836 + 5340721 = 5906^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 40221557 - 2⁸ = 40221301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40221757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20110778 + 20110779.

It is an arithmetic number, because the mean of its divisors is an integer number (20110779).

Almost surely, 2^40221557 is an apocalyptic number.

It is an amenable number.

40221557 is a deficient number, since it is larger than the sum of its proper divisors (1).

40221557 is an equidigital number, since it uses as much as digits as its factorization.

40221557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 40221557 is about 6342.0467516410. The cubic root of 40221557 is about 342.6254556658.

The spelling of 40221557 in words is "forty million, two hundred twenty-one thousand, five hundred fifty-seven".