26921089 has 16 divisors (see below), whose sum is σ = 30134608. Its totient is φ = 23887872.

The previous prime is 26921087. The next prime is 26921101. The reversal of 26921089 is 98012962.

It can be written as a sum of positive squares in 8 ways, for example, as 3301489 + 23619600 = 1817^2 + 4860^2 .

It is a 3-Lehmer number, since φ(26921089) divides (26921089-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 26921089 - 2¹ = 26921087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_26921088.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26921087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46369 + ... + 46945.

It is an arithmetic number, because the mean of its divisors is an integer number (1883413).

It is a Poulet number, since it divides 2^26921088-1.

Almost surely, 2^26921089 is an apocalyptic number.

It is an amenable number.

26921089 is a deficient number, since it is larger than the sum of its proper divisors (3213519).

26921089 is a wasteful number, since it uses less digits than its factorization.

26921089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 26921089 is about 5188.5536520306. The cubic root of 26921089 is about 299.7074518484.

The spelling of 26921089 in words is "twenty-six million, nine hundred twenty-one thousand, eighty-nine".