693890 has 8 divisors (see below), whose sum is σ = 1249020. Its totient is φ = 277552.

The previous prime is 693881. The next prime is 693943. The reversal of 693890 is 98396.

It is a Cunningham number, because it is equal to 833²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 693889 + 1 = 833^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 693890.

It is an unprimeable number.

693890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34685 + ... + 34704.

2⁶⁹³⁸⁹⁰ is an apocalyptic number.

693890 is a deficient number, since it is larger than the sum of its proper divisors (555130).

693890 is a wasteful number, since it uses less digits than its factorization.

693890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69396.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 693890 is about 833.0006002399. Note that the first 3 decimals coincide. The cubic root of 693890 is about 88.5313070848.

The spelling of 693890 in words is "six hundred ninety-three thousand, eight hundred ninety".