15749989 has 2 divisors, whose sum is σ = 15749990. Its totient is φ = 15749988.

The previous prime is 15749977. The next prime is 15750013. The reversal of 15749989 is 98994751.

15749989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 1119364 = 3825^2 + 1058^2 .

It is an emirp because it is prime and its reverse (98994751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15749989 - 2⁹ = 15749477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15749959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7874994 + 7874995.

It is an arithmetic number, because the mean of its divisors is an integer number (7874995).

Almost surely, 2^15749989 is an apocalyptic number.

It is an amenable number.

15749989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15749989 is an equidigital number, since it uses as much as digits as its factorization.

15749989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 15749989 is about 3968.6255807269. The cubic root of 15749989 is about 250.6648383924.

The spelling of 15749989 in words is "fifteen million, seven hundred forty-nine thousand, nine hundred eighty-nine".