19479980 has 24 divisors (see below), whose sum is σ = 44055312. Its totient is φ = 7192512.

The previous prime is 19479979. The next prime is 19479983. The reversal of 19479980 is 8997491.

It is not an unprimeable number, because it can be changed into a prime (19479983) by changing a digit.

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, 37202 + ... + 37721.

It is an arithmetic number, because the mean of its divisors is an integer number (1835638).

Almost surely, 2^19479980 is an apocalyptic number.

19479980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19479980 is an abundant number, since it is smaller than the sum of its proper divisors (24575332).

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

19479980 is a wasteful number, since it uses less digits than its factorization.

19479980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74945 (or 74943 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 19479980 is about 4413.6130324259. The cubic root of 19479980 is about 269.0684863142.

The spelling of 19479980 in words is "nineteen million, four hundred seventy-nine thousand, nine hundred eighty".