26949821 has 2 divisors, whose sum is σ = 26949822. Its totient is φ = 26949820.

The previous prime is 26949817. The next prime is 26949827. The reversal of 26949821 is 12894962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26894596 + 55225 = 5186^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 26949821 - 2² = 26949817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26949827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13474910 + 13474911.

It is an arithmetic number, because the mean of its divisors is an integer number (13474911).

Almost surely, 2^26949821 is an apocalyptic number.

It is an amenable number.

26949821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26949821 is an equidigital number, since it uses as much as digits as its factorization.

26949821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 26949821 is about 5191.3217006847. The cubic root of 26949821 is about 299.8140366011.

The spelling of 26949821 in words is "twenty-six million, nine hundred forty-nine thousand, eight hundred twenty-one".