26199989 has 2 divisors, whose sum is σ = 26199990. Its totient is φ = 26199988.

The previous prime is 26199977. The next prime is 26199997. The reversal of 26199989 is 98999162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17497489 + 8702500 = 4183^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 26199989 - 2¹⁶ = 26134453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26199989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26199949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13099994 + 13099995.

It is an arithmetic number, because the mean of its divisors is an integer number (13099995).

Almost surely, 2^26199989 is an apocalyptic number.

It is an amenable number.

26199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26199989 is an equidigital number, since it uses as much as digits as its factorization.

26199989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 53.

The square root of 26199989 is about 5118.5924823139. The cubic root of 26199989 is about 297.0072402034.

The spelling of 26199989 in words is "twenty-six million, one hundred ninety-nine thousand, nine hundred eighty-nine".