1428949821 has 8 divisors (see below), whose sum is σ = 2051825440. Its totient is φ = 879353712.

The previous prime is 1428949811. The next prime is 1428949843. The reversal of 1428949821 is 1289498241.

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

It is not a de Polignac number, because 1428949821 - 2¹⁰ = 1428948797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428949811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18319831 + ... + 18319908.

It is an arithmetic number, because the mean of its divisors is an integer number (256478180).

Almost surely, 2^1428949821 is an apocalyptic number.

It is an amenable number.

1428949821 is a deficient number, since it is larger than the sum of its proper divisors (622875619).

1428949821 is a wasteful number, since it uses less digits than its factorization.

1428949821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36639755.

The product of its digits is 331776, while the sum is 48.

The square root of 1428949821 is about 37801.4526308183. The cubic root of 1428949821 is about 1126.3473098552.

The spelling of 1428949821 in words is "one billion, four hundred twenty-eight million, nine hundred forty-nine thousand, eight hundred twenty-one".