19215980 has 48 divisors (see below), whose sum is σ = 47718720. Its totient is φ = 6359808.

The previous prime is 19215979. The next prime is 19216013. The reversal of 19215980 is 8951291.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 19215980.

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, 1694 + ... + 6426.

It is an arithmetic number, because the mean of its divisors is an integer number (994140).

Almost surely, 2^19215980 is an apocalyptic number.

19215980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19215980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23859360).

19215980 is an abundant number, since it is smaller than the sum of its proper divisors (28502740).

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

19215980 is a wasteful number, since it uses less digits than its factorization.

19215980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778 (or 4776 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 19215980 is about 4383.6035404676. The cubic root of 19215980 is about 267.8474478946.

The spelling of 19215980 in words is "nineteen million, two hundred fifteen thousand, nine hundred eighty".