1020866402 has 8 divisors (see below), whose sum is σ = 1536192876. Its totient is φ = 508802112.

The previous prime is 1020866393. The next prime is 1020866419. The reversal of 1020866402 is 2046680201.

It is a Cunningham number, because it is equal to 31951²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 1020866401 + 1 = 31951^2 + 1^2 .

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

It is a super-3 number, since 3×1020866402³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

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, 814763 + ... + 816014.

Almost surely, 2^1020866402 is an apocalyptic number.

1020866402 is a deficient number, since it is larger than the sum of its proper divisors (515326474).

1020866402 is a wasteful number, since it uses less digits than its factorization.

1020866402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631092.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1020866402 is about 31951.0000156490. Note that the first 4 decimals coincide. The cubic root of 1020866402 is about 1006.9076419488.

The spelling of 1020866402 in words is "one billion, twenty million, eight hundred sixty-six thousand, four hundred two".