26989191 has 12 divisors (see below), whose sum is σ = 39035568. Its totient is φ = 17969184.

The previous prime is 26989187. The next prime is 26989199. The reversal of 26989191 is 19198962.

It is not a de Polignac number, because 26989191 - 2² = 26989187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26989199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7846 + ... + 10748.

It is an arithmetic number, because the mean of its divisors is an integer number (3252964).

Almost surely, 2^26989191 is an apocalyptic number.

26989191 is a deficient number, since it is larger than the sum of its proper divisors (12046377).

26989191 is a wasteful number, since it uses less digits than its factorization.

26989191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3942 (or 3939 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 26989191 is about 5195.1122220795. The cubic root of 26989191 is about 299.9599613233.

The spelling of 26989191 in words is "twenty-six million, nine hundred eighty-nine thousand, one hundred ninety-one".