12907381 has 2 divisors, whose sum is σ = 12907382. Its totient is φ = 12907380.

The previous prime is 12907373. The next prime is 12907387. The reversal of 12907381 is 18370921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12895281 + 12100 = 3591^2 + 110^2 .

It is an emirp because it is prime and its reverse (18370921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12907381 - 2³ = 12907373 is a prime.

It is a super-2 number, since 2×12907381² = 333200968558322, 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 (12907387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6453690 + 6453691.

It is an arithmetic number, because the mean of its divisors is an integer number (6453691).

Almost surely, 2^12907381 is an apocalyptic number.

It is an amenable number.

12907381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12907381 is an equidigital number, since it uses as much as digits as its factorization.

12907381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 12907381 is about 3592.6843724435. The cubic root of 12907381 is about 234.5737315562.

The spelling of 12907381 in words is "twelve million, nine hundred seven thousand, three hundred eighty-one".