40225921 has 2 divisors, whose sum is σ = 40225922. Its totient is φ = 40225920.

The previous prime is 40225909. The next prime is 40225943. The reversal of 40225921 is 12952204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23415921 + 16810000 = 4839^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 40225921 - 2¹³ = 40217729 is a prime.

It is not a weakly prime, because it can be changed into another prime (40225421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20112960 + 20112961.

It is an arithmetic number, because the mean of its divisors is an integer number (20112961).

Almost surely, 2^40225921 is an apocalyptic number.

It is an amenable number.

40225921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40225921 is an equidigital number, since it uses as much as digits as its factorization.

40225921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 40225921 is about 6342.3907952759. The cubic root of 40225921 is about 342.6378467277.

The spelling of 40225921 in words is "forty million, two hundred twenty-five thousand, nine hundred twenty-one".