6890945 has 4 divisors (see below), whose sum is σ = 8269140. Its totient is φ = 5512752.

The previous prime is 6890861. The next prime is 6890957. The reversal of 6890945 is 5490986.

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 2745649 + 4145296 = 1657^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 6890945 - 2¹⁰ = 6889921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689090 + ... + 689099.

It is an arithmetic number, because the mean of its divisors is an integer number (2067285).

Almost surely, 2^6890945 is an apocalyptic number.

It is an amenable number.

6890945 is a deficient number, since it is larger than the sum of its proper divisors (1378195).

6890945 is a wasteful number, since it uses less digits than its factorization.

6890945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378194.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 6890945 is about 2625.0609516733. The cubic root of 6890945 is about 190.2945109376.

Adding to 6890945 its sum of digits (41), we get a palindrome (6890986).

The spelling of 6890945 in words is "six million, eight hundred ninety thousand, nine hundred forty-five".