19780930 has 32 divisors (see below), whose sum is σ = 39009600. Its totient is φ = 7177152.

The previous prime is 19780927. The next prime is 19780949. The reversal of 19780930 is 3908791.

It is a self number, because there is not a number n which added to its sum of digits gives 19780930.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6381 + ... + 8959.

It is an arithmetic number, because the mean of its divisors is an integer number (1219050).

Almost surely, 2^19780930 is an apocalyptic number.

19780930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19780930 is a deficient number, since it is larger than the sum of its proper divisors (19228670).

19780930 is a wasteful number, since it uses less digits than its factorization.

19780930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 19780930 is about 4447.5757441555. The cubic root of 19780930 is about 270.4470417701.

The spelling of 19780930 in words is "nineteen million, seven hundred eighty thousand, nine hundred thirty".