6890155 has 4 divisors (see below), whose sum is σ = 8268192. Its totient is φ = 5512120.

The previous prime is 6890123. The next prime is 6890161. The reversal of 6890155 is 5510986.

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

It is not a de Polignac number, because 6890155 - 2⁵ = 6890123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6890155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689011 + ... + 689020.

It is an arithmetic number, because the mean of its divisors is an integer number (2067048).

Almost surely, 2^6890155 is an apocalyptic number.

6890155 is a deficient number, since it is larger than the sum of its proper divisors (1378037).

6890155 is a wasteful number, since it uses less digits than its factorization.

6890155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378036.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 6890155 is about 2624.9104746639. The cubic root of 6890155 is about 190.2872386690.

The spelling of 6890155 in words is "six million, eight hundred ninety thousand, one hundred fifty-five".