13858381 has 2 divisors, whose sum is σ = 13858382. Its totient is φ = 13858380.

The previous prime is 13858363. The next prime is 13858409. The reversal of 13858381 is 18385831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 826281 = 3610^2 + 909^2 .

It is a cyclic number.

It is not a de Polignac number, because 13858381 - 2⁷ = 13858253 is a prime.

It is a super-2 number, since 2×13858381² = 384109447882322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13858381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13858301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6929190 + 6929191.

It is an arithmetic number, because the mean of its divisors is an integer number (6929191).

Almost surely, 2^13858381 is an apocalyptic number.

It is an amenable number.

13858381 is a deficient number, since it is larger than the sum of its proper divisors (1).

13858381 is an equidigital number, since it uses as much as digits as its factorization.

13858381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 13858381 is about 3722.6846495506. The cubic root of 13858381 is about 240.1987994032.

The spelling of 13858381 in words is "thirteen million, eight hundred fifty-eight thousand, three hundred eighty-one".