1620421803 has 144 divisors (see below), whose sum is σ = 3251259648. Its totient is φ = 750988800.

The previous prime is 1620421769. The next prime is 1620421819. The reversal of 1620421803 is 3081240261.

1620421803 is a `hidden beast` number, since 162 + 0 + 421 + 80 + 3 = 666.

It is not a de Polignac number, because 1620421803 - 2²⁴ = 1603644587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620422803) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 15144076 + ... + 15144182.

It is an arithmetic number, because the mean of its divisors is an integer number (22578192).

Almost surely, 2^1620421803 is an apocalyptic number.

1620421803 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1620421803 is an abundant number, since it is smaller than the sum of its proper divisors (1630837845).

1620421803 is a wasteful number, since it uses less digits than its factorization.

1620421803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1620421803 is about 40254.4631438552. The cubic root of 1620421803 is about 1174.5622157839.

The spelling of 1620421803 in words is "one billion, six hundred twenty million, four hundred twenty-one thousand, eight hundred three".