699340721 has 4 divisors (see below), whose sum is σ = 702655344. Its totient is φ = 696026100.

The previous prime is 699340693. The next prime is 699340727. The reversal of 699340721 is 127043996.

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 699340721 - 2²⁶ = 632231857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699340727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656995 + ... + 1657416.

It is an arithmetic number, because the mean of its divisors is an integer number (175663836).

Almost surely, 2^699340721 is an apocalyptic number.

It is an amenable number.

699340721 is a deficient number, since it is larger than the sum of its proper divisors (3314623).

699340721 is a wasteful number, since it uses less digits than its factorization.

699340721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314622.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 699340721 is about 26445.0509736699. The cubic root of 699340721 is about 887.6251634888.

The spelling of 699340721 in words is "six hundred ninety-nine million, three hundred forty thousand, seven hundred twenty-one".