6999977 has 4 divisors (see below), whose sum is σ = 7007700. Its totient is φ = 6992256.

The previous prime is 6999973. The next prime is 6999989. The reversal of 6999977 is 7799996.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3083536 + 3916441 = 1756^2 + 1979^2 .

It is a cyclic number.

It is not a de Polignac number, because 6999977 - 2² = 6999973 is a prime.

It is a super-3 number, since 3×6999977³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6999973) 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, 2288 + ... + 4385.

It is an arithmetic number, because the mean of its divisors is an integer number (1751925).

Almost surely, 2^6999977 is an apocalyptic number.

It is an amenable number.

6999977 is a deficient number, since it is larger than the sum of its proper divisors (7723).

6999977 is a wasteful number, since it uses less digits than its factorization.

6999977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7722.

The product of its digits is 1928934, while the sum is 56.

The square root of 6999977 is about 2645.7469644696. The cubic root of 6999977 is about 191.2929087655.

The spelling of 6999977 in words is "six million, nine hundred ninety-nine thousand, nine hundred seventy-seven".