19987375 has 8 divisors (see below), whose sum is σ = 24944400. Its totient is φ = 15989800.

The previous prime is 19987367. The next prime is 19987379. The reversal of 19987375 is 57378991.

It is not a de Polignac number, because 19987375 - 2³ = 19987367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19987379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79825 + ... + 80074.

It is an arithmetic number, because the mean of its divisors is an integer number (3118050).

Almost surely, 2^19987375 is an apocalyptic number.

19987375 is a deficient number, since it is larger than the sum of its proper divisors (4957025).

19987375 is an equidigital number, since it uses as much as digits as its factorization.

19987375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159914 (or 159904 counting only the distinct ones).

The product of its digits is 476280, while the sum is 49.

The square root of 19987375 is about 4470.7242142633. The cubic root of 19987375 is about 271.3846337665.

The spelling of 19987375 in words is "nineteen million, nine hundred eighty-seven thousand, three hundred seventy-five".