402809816930 has 8 divisors (see below), whose sum is σ = 725057670492. Its totient is φ = 161123926768.

The previous prime is 402809816917. The next prime is 402809816963. The reversal of 402809816930 is 39618908204.

It is a happy number.

It is a Cunningham number, because it is equal to 634673²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 402809816929 + 1 = 634673^2 + 1^2 .

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

It is a super-2 number, since 2×402809816930² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20140490837 + ... + 20140490856.

Almost surely, 2^402809816930 is an apocalyptic number.

402809816930 is a deficient number, since it is larger than the sum of its proper divisors (322247853562).

402809816930 is a wasteful number, since it uses less digits than its factorization.

402809816930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40280981700.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 402809816930 in words is "four hundred two billion, eight hundred nine million, eight hundred sixteen thousand, nine hundred thirty".