26642399 has 8 divisors (see below), whose sum is σ = 30609408. Its totient is φ = 22715640.

The previous prime is 26642393. The next prime is 26642431. The reversal of 26642399 is 99324662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26642399 - 2¹⁶ = 26576863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26642393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8627 + ... + 11300.

It is an arithmetic number, because the mean of its divisors is an integer number (3826176).

Almost surely, 2^26642399 is an apocalyptic number.

26642399 is a deficient number, since it is larger than the sum of its proper divisors (3967009).

26642399 is a wasteful number, since it uses less digits than its factorization.

26642399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20125.

The product of its digits is 139968, while the sum is 41.

The square root of 26642399 is about 5161.6275533982. The cubic root of 26642399 is about 298.6696612345.

It can be divided in two parts, 2664 and 2399, that multiplied together give a palindrome (6390936).

The spelling of 26642399 in words is "twenty-six million, six hundred forty-two thousand, three hundred ninety-nine".