1421778625 has 8 divisors (see below), whose sum is σ = 1774379880. Its totient is φ = 1137422800.

The previous prime is 1421778599. The next prime is 1421778713. The reversal of 1421778625 is 5268771241.

It can be written as a sum of positive squares in 4 ways, for example, as 1317904 + 1420460721 = 1148^2 + 37689^2 .

It is not a de Polignac number, because 1421778625 - 2⁵ = 1421778593 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 5686990 + ... + 5687239.

It is an arithmetic number, because the mean of its divisors is an integer number (221797485).

Almost surely, 2^1421778625 is an apocalyptic number.

It is an amenable number.

1421778625 is a deficient number, since it is larger than the sum of its proper divisors (352601255).

1421778625 is an equidigital number, since it uses as much as digits as its factorization.

1421778625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11374244 (or 11374234 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 1421778625 is about 37706.4798807844. The cubic root of 1421778625 is about 1124.4599547898.

The spelling of 1421778625 in words is "one billion, four hundred twenty-one million, seven hundred seventy-eight thousand, six hundred twenty-five".