40075621 has 2 divisors, whose sum is σ = 40075622. Its totient is φ = 40075620.

The previous prime is 40075603. The next prime is 40075627. The reversal of 40075621 is 12657004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38266596 + 1809025 = 6186^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 40075621 - 2⁵ = 40075589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40075627) 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, 20037810 + 20037811.

It is an arithmetic number, because the mean of its divisors is an integer number (20037811).

Almost surely, 2^40075621 is an apocalyptic number.

It is an amenable number.

40075621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40075621 is an equidigital number, since it uses as much as digits as its factorization.

40075621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 40075621 is about 6330.5308624159. The cubic root of 40075621 is about 342.2105704829.

The spelling of 40075621 in words is "forty million, seventy-five thousand, six hundred twenty-one".