26971987 has 4 divisors (see below), whose sum is σ = 30825136. Its totient is φ = 23118840.

The previous prime is 26971981. The next prime is 26971993. The reversal of 26971987 is 78917962.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (26971981) and next prime (26971993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26971987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26971987.

It is not an unprimeable number, because it can be changed into a prime (26971981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1926564 + ... + 1926577.

It is an arithmetic number, because the mean of its divisors is an integer number (7706284).

Almost surely, 2^26971987 is an apocalyptic number.

26971987 is a deficient number, since it is larger than the sum of its proper divisors (3853149).

26971987 is an equidigital number, since it uses as much as digits as its factorization.

26971987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3853148.

The product of its digits is 381024, while the sum is 49.

The square root of 26971987 is about 5193.4561709906. The cubic root of 26971987 is about 299.8962122460.

The spelling of 26971987 in words is "twenty-six million, nine hundred seventy-one thousand, nine hundred eighty-seven".