6890350405 has 4 divisors (see below), whose sum is σ = 8268420492. Its totient is φ = 5512280320.

The previous prime is 6890350367. The next prime is 6890350409. The reversal of 6890350405 is 5040530986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2445994849 + 4444355556 = 49457^2 + 66666^2 .

It is not a de Polignac number, because 6890350405 - 2¹⁹ = 6889826117 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6890350409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689035036 + ... + 689035045.

It is an arithmetic number, because the mean of its divisors is an integer number (2067105123).

Almost surely, 2^6890350405 is an apocalyptic number.

It is an amenable number.

6890350405 is a deficient number, since it is larger than the sum of its proper divisors (1378070087).

6890350405 is a wasteful number, since it uses less digits than its factorization.

6890350405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378070086.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 6890350405 is about 83008.1345712575. The cubic root of 6890350405 is about 1902.8903750255.

The spelling of 6890350405 in words is "six billion, eight hundred ninety million, three hundred fifty thousand, four hundred five".