26921890 has 16 divisors (see below), whose sum is σ = 48522240. Its totient is φ = 10754800.

The previous prime is 26921887. The next prime is 26921893. The reversal of 26921890 is 9812962.

It is an interprime number because it is at equal distance from previous prime (26921887) and next prime (26921893).

It is a super-2 number, since 2×26921890² = 1449576322344200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26921893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10341 + ... + 12679.

It is an arithmetic number, because the mean of its divisors is an integer number (3032640).

Almost surely, 2^26921890 is an apocalyptic number.

26921890 is a deficient number, since it is larger than the sum of its proper divisors (21600350).

26921890 is a wasteful number, since it uses less digits than its factorization.

26921890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497.

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

The square root of 26921890 is about 5188.6308405975. The cubic root of 26921890 is about 299.7104242800.

The spelling of 26921890 in words is "twenty-six million, nine hundred twenty-one thousand, eight hundred ninety".