699640 has 16 divisors (see below), whose sum is σ = 1574280. Its totient is φ = 279840.

The previous prime is 699631. The next prime is 699641. The reversal of 699640 is 46996.

It is a super-2 number, since 2×699640² = 978992259200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 699596 and 699605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699641) 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 3 ways as a sum of consecutive naturals, for example, 8706 + ... + 8785.

2⁶⁹⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

699640 is an abundant number, since it is smaller than the sum of its proper divisors (874640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

699640 is a wasteful number, since it uses less digits than its factorization.

699640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17502 (or 17498 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 699640 is about 836.4448577163. Note that the first 3 decimals coincide. The cubic root of 699640 is about 88.7751763527.

The spelling of 699640 in words is "six hundred ninety-nine thousand, six hundred forty".