1421687808 has 88 divisors (see below), whose sum is σ = 4210433360. Its totient is φ = 473886720.

The previous prime is 1421687783. The next prime is 1421687837. The reversal of 1421687808 is 8087861241.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1938 + ... + 53358.

Almost surely, 2^1421687808 is an apocalyptic number.

1421687808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421687808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2105216680).

1421687808 is an abundant number, since it is smaller than the sum of its proper divisors (2788745552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1421687808 is an equidigital number, since it uses as much as digits as its factorization.

1421687808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51450 (or 51426 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 1421687808 is about 37705.2755990458. The cubic root of 1421687808 is about 1124.4360124188.

The spelling of 1421687808 in words is "one billion, four hundred twenty-one million, six hundred eighty-seven thousand, eight hundred eight".