1688059397 has 4 divisors (see below), whose sum is σ = 1688322636. Its totient is φ = 1687796160.

The previous prime is 1688059391. The next prime is 1688059411. The reversal of 1688059397 is 7939508861.

It is a Cunningham number, because it is equal to 41086²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1671664996 + 16394401 = 40886^2 + 4049^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688059397 - 2⁸ = 1688059141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688059391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121754 + ... + 134907.

It is an arithmetic number, because the mean of its divisors is an integer number (422080659).

Almost surely, 2^1688059397 is an apocalyptic number.

It is an amenable number.

1688059397 is a deficient number, since it is larger than the sum of its proper divisors (263239).

1688059397 is an equidigital number, since it uses as much as digits as its factorization.

1688059397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263238.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The square root of 1688059397 is about 41086.0000121696. Note that the first 4 decimals coincide. The cubic root of 1688059397 is about 1190.6823281292.

The spelling of 1688059397 in words is "one billion, six hundred eighty-eight million, fifty-nine thousand, three hundred ninety-seven".