1421647828 has 6 divisors (see below), whose sum is σ = 2487883706. Its totient is φ = 710823912.

The previous prime is 1421647823. The next prime is 1421647853. The reversal of 1421647828 is 8287461241.

It can be written as a sum of positive squares in only one way, i.e., 1407600324 + 14047504 = 37518^2 + 3748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421647823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177705975 + ... + 177705982.

Almost surely, 2^1421647828 is an apocalyptic number.

It is an amenable number.

1421647828 is a deficient number, since it is larger than the sum of its proper divisors (1066235878).

1421647828 is a wasteful number, since it uses less digits than its factorization.

1421647828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355411961 (or 355411959 counting only the distinct ones).

The product of its digits is 172032, while the sum is 43.

The square root of 1421647828 is about 37704.7454307810. The cubic root of 1421647828 is about 1124.4254720426.

The spelling of 1421647828 in words is "one billion, four hundred twenty-one million, six hundred forty-seven thousand, eight hundred twenty-eight".