690993 has 6 divisors (see below), whose sum is σ = 998114. Its totient is φ = 460656.

The previous prime is 690953. The next prime is 690997. The reversal of 690993 is 399096.

It can be written as a sum of positive squares in only one way, i.e., 471969 + 219024 = 687^2 + 468^2 .

It is not a de Polignac number, because 690993 - 2⁶ = 690929 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690993.

It is not an unprimeable number, because it can be changed into a prime (690997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38380 + ... + 38397.

2⁶⁹⁰⁹⁹³ is an apocalyptic number.

It is an amenable number.

690993 is a deficient number, since it is larger than the sum of its proper divisors (307121).

690993 is a wasteful number, since it uses less digits than its factorization.

690993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76783 (or 76780 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 690993 is about 831.2598871592. The cubic root of 690993 is about 88.4079287607.

The spelling of 690993 in words is "six hundred ninety thousand, nine hundred ninety-three".