1521920428 has 24 divisors (see below), whose sum is σ = 3055981824. Its totient is φ = 649650000.

The previous prime is 1521920401. The next prime is 1521920437. The reversal of 1521920428 is 8240291251.

It is a junction number, because it is equal to n+sod(n) for n = 1521920393 and 1521920402.

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, 101248 + ... + 115303.

It is an arithmetic number, because the mean of its divisors is an integer number (127332576).

Almost surely, 2^1521920428 is an apocalyptic number.

It is an amenable number.

1521920428 is an abundant number, since it is smaller than the sum of its proper divisors (1534061396).

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

1521920428 is a wasteful number, since it uses less digits than its factorization.

1521920428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216813 (or 216811 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1521920428 is about 39011.7985742775. The cubic root of 1521920428 is about 1150.2634375687.

The spelling of 1521920428 in words is "one billion, five hundred twenty-one million, nine hundred twenty thousand, four hundred twenty-eight".