40238521 has 2 divisors, whose sum is σ = 40238522. Its totient is φ = 40238520.

The previous prime is 40238503. The next prime is 40238537. The reversal of 40238521 is 12583204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 1860496 = 6195^2 + 1364^2 .

It is a cyclic number.

It is not a de Polignac number, because 40238521 - 2⁵ = 40238489 is a prime.

It is not a weakly prime, because it can be changed into another prime (40238551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20119260 + 20119261.

It is an arithmetic number, because the mean of its divisors is an integer number (20119261).

Almost surely, 2^40238521 is an apocalyptic number.

It is an amenable number.

40238521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40238521 is an equidigital number, since it uses as much as digits as its factorization.

40238521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 40238521 is about 6343.3840337788. The cubic root of 40238521 is about 342.6736179094.

It can be divided in two parts, 4023 and 8521, that added together give a square (12544 = 112²).

The spelling of 40238521 in words is "forty million, two hundred thirty-eight thousand, five hundred twenty-one".