693720409 has 4 divisors (see below), whose sum is σ = 702501760. Its totient is φ = 684939060.

The previous prime is 693720403. The next prime is 693720413. The reversal of 693720409 is 904027396.

693720409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 693720409 - 2¹⁵ = 693687641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (693720403) 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, 4390557 + ... + 4390714.

It is an arithmetic number, because the mean of its divisors is an integer number (175625440).

Almost surely, 2^693720409 is an apocalyptic number.

It is an amenable number.

693720409 is a deficient number, since it is larger than the sum of its proper divisors (8781351).

693720409 is an equidigital number, since it uses as much as digits as its factorization.

693720409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8781350.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 693720409 is about 26338.5726454567. The cubic root of 693720409 is about 885.2409396441.

The spelling of 693720409 in words is "six hundred ninety-three million, seven hundred twenty thousand, four hundred nine".