26440042 has 4 divisors (see below), whose sum is σ = 39660066. Its totient is φ = 13220020.

The previous prime is 26440033. The next prime is 26440061. The reversal of 26440042 is 24004462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24004462 = 2 ⋅12002231.

It can be written as a sum of positive squares in only one way, i.e., 23415921 + 3024121 = 4839^2 + 1739^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26439995 and 26440022.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610009 + ... + 6610012.

Almost surely, 2^26440042 is an apocalyptic number.

26440042 is a deficient number, since it is larger than the sum of its proper divisors (13220024).

26440042 is a wasteful number, since it uses less digits than its factorization.

26440042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13220023.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 26440042 is about 5141.9881368980. The cubic root of 26440042 is about 297.9115768464.

The spelling of 26440042 in words is "twenty-six million, four hundred forty thousand, forty-two".