13989427 has 2 divisors, whose sum is σ = 13989428. Its totient is φ = 13989426.

The previous prime is 13989421. The next prime is 13989433. The reversal of 13989427 is 72498931.

It is a balanced prime because it is at equal distance from previous prime (13989421) and next prime (13989433).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13989427 is a prime.

It is not a weakly prime, because it can be changed into another prime (13989421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6994713 + 6994714.

It is an arithmetic number, because the mean of its divisors is an integer number (6994714).

Almost surely, 2^13989427 is an apocalyptic number.

13989427 is a deficient number, since it is larger than the sum of its proper divisors (1).

13989427 is an equidigital number, since it uses as much as digits as its factorization.

13989427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 13989427 is about 3740.2442433617. The cubic root of 13989427 is about 240.9535386753.

The spelling of 13989427 in words is "thirteen million, nine hundred eighty-nine thousand, four hundred twenty-seven".