6899861 has 4 divisors (see below), whose sum is σ = 7002912. Its totient is φ = 6796812.

The previous prime is 6899819. The next prime is 6899863. The reversal of 6899861 is 1689986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6899861 - 2¹⁴ = 6883477 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6899863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51425 + ... + 51558.

It is an arithmetic number, because the mean of its divisors is an integer number (1750728).

Almost surely, 2^6899861 is an apocalyptic number.

It is an amenable number.

6899861 is a deficient number, since it is larger than the sum of its proper divisors (103051).

6899861 is a wasteful number, since it uses less digits than its factorization.

6899861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103050.

The product of its digits is 186624, while the sum is 47.

The square root of 6899861 is about 2626.7586489817. The cubic root of 6899861 is about 190.3765478052.

The spelling of 6899861 in words is "six million, eight hundred ninety-nine thousand, eight hundred sixty-one".