689440797 has 12 divisors (see below), whose sum is σ = 1054439100. Its totient is φ = 432590208.

The previous prime is 689440781. The next prime is 689440819. The reversal of 689440797 is 797044986.

It is a happy number.

689440797 is a `hidden beast` number, since 68 + 94 + 407 + 97 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 265657401 + 423783396 = 16299^2 + 20586^2 .

It is not a de Polignac number, because 689440797 - 2⁴ = 689440781 is a prime.

It is a super-2 number, since 2×689440797² = 950657225135990418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689440747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2252922 + ... + 2253227.

It is an arithmetic number, because the mean of its divisors is an integer number (87869925).

Almost surely, 2^689440797 is an apocalyptic number.

It is an amenable number.

689440797 is a deficient number, since it is larger than the sum of its proper divisors (364998303).

689440797 is a wasteful number, since it uses less digits than its factorization.

689440797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506172 (or 4506169 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The square root of 689440797 is about 26257.2046684334. The cubic root of 689440797 is about 883.4168113664.

The spelling of 689440797 in words is "six hundred eighty-nine million, four hundred forty thousand, seven hundred ninety-seven".