40918421 has 2 divisors, whose sum is σ = 40918422. Its totient is φ = 40918420.

The previous prime is 40918417. The next prime is 40918429. The reversal of 40918421 is 12481904.

40918421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 2292196 = 6215^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 40918421 - 2² = 40918417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40918429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20459210 + 20459211.

It is an arithmetic number, because the mean of its divisors is an integer number (20459211).

Almost surely, 2^40918421 is an apocalyptic number.

It is an amenable number.

40918421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40918421 is an equidigital number, since it uses as much as digits as its factorization.

40918421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 40918421 is about 6396.7508158439. The cubic root of 40918421 is about 344.5928712800.

The spelling of 40918421 in words is "forty million, nine hundred eighteen thousand, four hundred twenty-one".