699979 has 12 divisors (see below), whose sum is σ = 847344. Its totient is φ = 566352.

The previous prime is 699967. The next prime is 700001. The reversal of 699979 is 979996.

It is a happy number.

It is not a de Polignac number, because 699979 - 2⁵ = 699947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699379) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2389 + ... + 2665.

It is an arithmetic number, because the mean of its divisors is an integer number (70612).

2⁶⁹⁹⁹⁷⁹ is an apocalyptic number.

699979 is a deficient number, since it is larger than the sum of its proper divisors (147365).

699979 is a wasteful number, since it uses less digits than its factorization.

699979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 303 counting only the distinct ones).

The product of its digits is 275562, while the sum is 49.

The square root of 699979 is about 836.6474765396. The cubic root of 699979 is about 88.7895122614.

It can be divided in two parts, 69 and 9979, that multiplied together give a triangular number (688551 = T₁₁₇₃).

The spelling of 699979 in words is "six hundred ninety-nine thousand, nine hundred seventy-nine".