40620421 has 2 divisors, whose sum is σ = 40620422. Its totient is φ = 40620420.

The previous prime is 40620409. The next prime is 40620431. The reversal of 40620421 is 12402604.

40620421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37344321 + 3276100 = 6111^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 40620421 - 2⁵ = 40620389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40620431) 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, 20310210 + 20310211.

It is an arithmetic number, because the mean of its divisors is an integer number (20310211).

Almost surely, 2^40620421 is an apocalyptic number.

It is an amenable number.

40620421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40620421 is an equidigital number, since it uses as much as digits as its factorization.

40620421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40620421 is about 6373.4151755554. The cubic root of 40620421 is about 343.7543005082.

It can be divided in two parts, 40620 and 421, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 40620421 in words is "forty million, six hundred twenty thousand, four hundred twenty-one".