699669 has 18 divisors (see below), whose sum is σ = 1077570. Its totient is φ = 437376.

The previous prime is 699649. The next prime is 699697. The reversal of 699669 is 966996.

699669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 119025 + 580644 = 345^2 + 762^2 .

It is not a de Polignac number, because 699669 - 2⁷ = 699541 is a prime.

It is a super-2 number, since 2×699669² = 979073419122, which contains 22 as substring.

699669 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699649) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2467 + ... + 2735.

It is an arithmetic number, because the mean of its divisors is an integer number (59865).

2⁶⁹⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

699669 is a deficient number, since it is larger than the sum of its proper divisors (377901).

699669 is a wasteful number, since it uses less digits than its factorization.

699669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 289 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 699669 is about 836.4621928097. The cubic root of 699669 is about 88.7764029095.

The spelling of 699669 in words is "six hundred ninety-nine thousand, six hundred sixty-nine".