19872015 has 12 divisors (see below), whose sum is σ = 31822872. Its totient is φ = 10589200.

The previous prime is 19872001. The next prime is 19872019. The reversal of 19872015 is 51027891.

It is not a de Polignac number, because 19872015 - 2⁹ = 19871503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19872019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16690 + ... + 17840.

It is an arithmetic number, because the mean of its divisors is an integer number (2651906).

Almost surely, 2^19872015 is an apocalyptic number.

19872015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19872015 is a deficient number, since it is larger than the sum of its proper divisors (11950857).

19872015 is an frugal number, since it uses more digits than its factorization.

19872015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310 (or 1159 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 19872015 is about 4457.8038314847. The cubic root of 19872015 is about 270.8615142800.

The spelling of 19872015 in words is "nineteen million, eight hundred seventy-two thousand, fifteen".