26389987 has 12 divisors (see below), whose sum is σ = 28848400. Its totient is φ = 23997600.

The previous prime is 26389963. The next prime is 26389997. The reversal of 26389987 is 78998362.

It is not a de Polignac number, because 26389987 - 2¹⁹ = 25865699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26389997) 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, 132514 + ... + 132712.

Almost surely, 2^26389987 is an apocalyptic number.

26389987 is a deficient number, since it is larger than the sum of its proper divisors (2458413).

26389987 is a wasteful number, since it uses less digits than its factorization.

26389987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 313 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 26389987 is about 5137.1185503159. The cubic root of 26389987 is about 297.7234608557.

The spelling of 26389987 in words is "twenty-six million, three hundred eighty-nine thousand, nine hundred eighty-seven".