19878970 has 16 divisors (see below), whose sum is σ = 35843328. Its totient is φ = 7938000.

The previous prime is 19878941. The next prime is 19878983. The reversal of 19878970 is 7987891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6187 + ... + 8833.

It is an arithmetic number, because the mean of its divisors is an integer number (2240208).

Almost surely, 2^19878970 is an apocalyptic number.

19878970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19878970 is a deficient number, since it is larger than the sum of its proper divisors (15964358).

19878970 is a wasteful number, since it uses less digits than its factorization.

19878970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 19878970 is about 4458.5838558897. The cubic root of 19878970 is about 270.8931101716.

The spelling of 19878970 in words is "nineteen million, eight hundred seventy-eight thousand, nine hundred seventy".