26231987 has 4 divisors (see below), whose sum is σ = 26329056. Its totient is φ = 26134920.

The previous prime is 26231963. The next prime is 26231993. The reversal of 26231987 is 78913262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78913262 = 2 ⋅39456631.

It is a cyclic number.

It is not a de Polignac number, because 26231987 - 2¹⁴ = 26215603 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 26231987.

It is not an unprimeable number, because it can be changed into a prime (26231957) 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, 48128 + ... + 48669.

It is an arithmetic number, because the mean of its divisors is an integer number (6582264).

Almost surely, 2^26231987 is an apocalyptic number.

26231987 is a deficient number, since it is larger than the sum of its proper divisors (97069).

26231987 is an equidigital number, since it uses as much as digits as its factorization.

26231987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97068.

The product of its digits is 36288, while the sum is 38.

The square root of 26231987 is about 5121.7171925049. The cubic root of 26231987 is about 297.1281024853.

The spelling of 26231987 in words is "twenty-six million, two hundred thirty-one thousand, nine hundred eighty-seven".