13858421 has 2 divisors, whose sum is σ = 13858422. Its totient is φ = 13858420.

The previous prime is 13858409. The next prime is 13858447. The reversal of 13858421 is 12485831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 4774225 = 3014^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 13858421 - 2⁶ = 13858357 is a prime.

It is a super-2 number, since 2×13858421² = 384111665226482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13858321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6929210 + 6929211.

It is an arithmetic number, because the mean of its divisors is an integer number (6929211).

Almost surely, 2^13858421 is an apocalyptic number.

It is an amenable number.

13858421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13858421 is an equidigital number, since it uses as much as digits as its factorization.

13858421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 13858421 is about 3722.6900220137. The cubic root of 13858421 is about 240.1990305015.

The spelling of 13858421 in words is "thirteen million, eight hundred fifty-eight thousand, four hundred twenty-one".