13840621 has 2 divisors, whose sum is σ = 13840622. Its totient is φ = 13840620.

The previous prime is 13840613. The next prime is 13840643. The reversal of 13840621 is 12604831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7784100 + 6056521 = 2790^2 + 2461^2 .

It is a cyclic number.

It is not a de Polignac number, because 13840621 - 2³ = 13840613 is a prime.

It is equal to p₉₀₀₃₉₄ and since 13840621 and 900394 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13840661) 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, 6920310 + 6920311.

It is an arithmetic number, because the mean of its divisors is an integer number (6920311).

Almost surely, 2^13840621 is an apocalyptic number.

It is an amenable number.

13840621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13840621 is an equidigital number, since it uses as much as digits as its factorization.

13840621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 13840621 is about 3720.2985095285. The cubic root of 13840621 is about 240.0961478191.

The spelling of 13840621 in words is "thirteen million, eight hundred forty thousand, six hundred twenty-one".