19887345 has 24 divisors (see below), whose sum is σ = 35208576. Its totient is φ = 10379808.

The previous prime is 19887323. The next prime is 19887353. The reversal of 19887345 is 54378891.

It is not a de Polignac number, because 19887345 - 2⁹ = 19886833 is a prime.

It is a super-2 number, since 2×19887345² = 791012982298050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19887345.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2587 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (1467024).

Almost surely, 2^19887345 is an apocalyptic number.

19887345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19887345 is a deficient number, since it is larger than the sum of its proper divisors (15321231).

19887345 is a wasteful number, since it uses less digits than its factorization.

19887345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9461 (or 9458 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 19887345 is about 4459.5229565504. The cubic root of 19887345 is about 270.9311472072.

It can be divided in two parts, 19 and 887345, that added together give a square (887364 = 942²).

The spelling of 19887345 in words is "nineteen million, eight hundred eighty-seven thousand, three hundred forty-five".