15725389 has 2 divisors, whose sum is σ = 15725390. Its totient is φ = 15725388.

The previous prime is 15725387. The next prime is 15725393. The reversal of 15725389 is 98352751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13564489 + 2160900 = 3683^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 15725389 - 2¹ = 15725387 is a prime.

Together with 15725387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15725387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7862694 + 7862695.

It is an arithmetic number, because the mean of its divisors is an integer number (7862695).

Almost surely, 2^15725389 is an apocalyptic number.

It is an amenable number.

15725389 is a deficient number, since it is larger than the sum of its proper divisors (1).

15725389 is an equidigital number, since it uses as much as digits as its factorization.

15725389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 15725389 is about 3965.5250598124. The cubic root of 15725389 is about 250.5342654285.

The spelling of 15725389 in words is "fifteen million, seven hundred twenty-five thousand, three hundred eighty-nine".