26821987 has 2 divisors, whose sum is σ = 26821988. Its totient is φ = 26821986.

The previous prime is 26821961. The next prime is 26822017. The reversal of 26821987 is 78912862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26821987 - 2¹⁵ = 26789219 is a prime.

It is not a weakly prime, because it can be changed into another prime (26821187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13410993 + 13410994.

It is an arithmetic number, because the mean of its divisors is an integer number (13410994).

Almost surely, 2^26821987 is an apocalyptic number.

26821987 is a deficient number, since it is larger than the sum of its proper divisors (1).

26821987 is an equidigital number, since it uses as much as digits as its factorization.

26821987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 26821987 is about 5178.9947866357. The cubic root of 26821987 is about 299.3392383077.

The spelling of 26821987 in words is "twenty-six million, eight hundred twenty-one thousand, nine hundred eighty-seven".