1421828709 has 16 divisors (see below), whose sum is σ = 2219441280. Its totient is φ = 792656640.

The previous prime is 1421828701. The next prime is 1421828741. The reversal of 1421828709 is 9078281241.

It is not a de Polignac number, because 1421828709 - 2³ = 1421828701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421828701) 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 15 ways as a sum of consecutive naturals, for example, 824824 + ... + 826545.

It is an arithmetic number, because the mean of its divisors is an integer number (138715080).

Almost surely, 2^1421828709 is an apocalyptic number.

It is an amenable number.

1421828709 is a deficient number, since it is larger than the sum of its proper divisors (797612571).

1421828709 is a wasteful number, since it uses less digits than its factorization.

1421828709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651420.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 1421828709 is about 37707.1440048169. The cubic root of 1421828709 is about 1124.4731581559.

The spelling of 1421828709 in words is "one billion, four hundred twenty-one million, eight hundred twenty-eight thousand, seven hundred nine".