26379989 has 2 divisors, whose sum is σ = 26379990. Its totient is φ = 26379988.

The previous prime is 26379959. The next prime is 26380007. The reversal of 26379989 is 98997362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20857489 + 5522500 = 4567^2 + 2350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26379989 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 26379989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26379929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13189994 + 13189995.

It is an arithmetic number, because the mean of its divisors is an integer number (13189995).

Almost surely, 2^26379989 is an apocalyptic number.

It is an amenable number.

26379989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26379989 is an equidigital number, since it uses as much as digits as its factorization.

26379989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 53.

The square root of 26379989 is about 5136.1453445166. The cubic root of 26379989 is about 297.6858580186.

The spelling of 26379989 in words is "twenty-six million, three hundred seventy-nine thousand, nine hundred eighty-nine".