6899845 has 4 divisors (see below), whose sum is σ = 8279820. Its totient is φ = 5519872.

The previous prime is 6899819. The next prime is 6899863. The reversal of 6899845 is 5489986.

It is a happy number.

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 2643876 + 4255969 = 1626^2 + 2063^2 .

It is a cyclic number.

It is not a de Polignac number, because 6899845 - 2⁵ = 6899813 is a prime.

It is a super-2 number, since 2×6899845² = 95215722048050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

6899845 is a lucky number.

It is a nialpdrome in base 14.

It is a congruent 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, 689980 + ... + 689989.

It is an arithmetic number, because the mean of its divisors is an integer number (2069955).

Almost surely, 2^6899845 is an apocalyptic number.

It is an amenable number.

6899845 is a deficient number, since it is larger than the sum of its proper divisors (1379975).

6899845 is a wasteful number, since it uses less digits than its factorization.

6899845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379974.

The product of its digits is 622080, while the sum is 49.

The square root of 6899845 is about 2626.7556034013. The cubic root of 6899845 is about 190.3764006512.

It can be divided in two parts, 6899 and 845, that added together give a square (7744 = 88²).

The spelling of 6899845 in words is "six million, eight hundred ninety-nine thousand, eight hundred forty-five".