13891457 has 2 divisors, whose sum is σ = 13891458. Its totient is φ = 13891456.

The previous prime is 13891453. The next prime is 13891463. The reversal of 13891457 is 75419831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 3400336 = 3239^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 13891457 - 2² = 13891453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13891457.

It is not a weakly prime, because it can be changed into another prime (13891453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945728 + 6945729.

It is an arithmetic number, because the mean of its divisors is an integer number (6945729).

Almost surely, 2^13891457 is an apocalyptic number.

It is an amenable number.

13891457 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891457 is an equidigital number, since it uses as much as digits as its factorization.

13891457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 13891457 is about 3727.1244948351. The cubic root of 13891457 is about 240.3897429001.

The spelling of 13891457 in words is "thirteen million, eight hundred ninety-one thousand, four hundred fifty-seven".