693862021 has 8 divisors (see below), whose sum is σ = 741953304. Its totient is φ = 646579200.

The previous prime is 693862019. The next prime is 693862079. The reversal of 693862021 is 120268396.

It can be written as a sum of positive squares in 4 ways, for example, as 129276900 + 564585121 = 11370^2 + 23761^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 693862021 - 2¹ = 693862019 is a prime.

It is a super-4 number, since 4×693862021⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (693866021) 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 7 ways as a sum of consecutive naturals, for example, 200340 + ... + 203773.

It is an arithmetic number, because the mean of its divisors is an integer number (92744163).

Almost surely, 2^693862021 is an apocalyptic number.

It is an amenable number.

693862021 is a deficient number, since it is larger than the sum of its proper divisors (48091283).

693862021 is a wasteful number, since it uses less digits than its factorization.

693862021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404231.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 693862021 is about 26341.2608088527. The cubic root of 693862021 is about 885.3011715036.

The spelling of 693862021 in words is "six hundred ninety-three million, eight hundred sixty-two thousand, twenty-one".