19981715 has 32 divisors (see below), whose sum is σ = 27760320. Its totient is φ = 13757952.

The previous prime is 19981697. The next prime is 19981723. The reversal of 19981715 is 51718991.

It is not a de Polignac number, because 19981715 - 2¹⁶ = 19916179 is a prime.

Its product of digits (22680) is a multiple of the sum of its prime factors (168).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186692 + ... + 186798.

It is an arithmetic number, because the mean of its divisors is an integer number (867510).

Almost surely, 2^19981715 is an apocalyptic number.

19981715 is a deficient number, since it is larger than the sum of its proper divisors (7778605).

19981715 is a wasteful number, since it uses less digits than its factorization.

19981715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 142 counting only the distinct ones).

The product of its digits is 22680, while the sum is 41.

The square root of 19981715 is about 4470.0911623814. The cubic root of 19981715 is about 271.3590145603.

The spelling of 19981715 in words is "nineteen million, nine hundred eighty-one thousand, seven hundred fifteen".