13423987 has 2 divisors, whose sum is σ = 13423988. Its totient is φ = 13423986.

The previous prime is 13423981. The next prime is 13424003. The reversal of 13423987 is 78932431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13423987 - 2³ = 13423979 is a prime.

It is not a weakly prime, because it can be changed into another prime (13423981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6711993 + 6711994.

It is an arithmetic number, because the mean of its divisors is an integer number (6711994).

Almost surely, 2^13423987 is an apocalyptic number.

13423987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13423987 is an equidigital number, since it uses as much as digits as its factorization.

13423987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 13423987 is about 3663.8759531403. The cubic root of 13423987 is about 237.6624159599.

It can be divided in two parts, 1342 and 3987, that added together give a square (5329 = 73²).

The spelling of 13423987 in words is "thirteen million, four hundred twenty-three thousand, nine hundred eighty-seven".