19113985 has 16 divisors (see below), whose sum is σ = 25183872. Its totient is φ = 13811200.

The previous prime is 19113977. The next prime is 19114003. The reversal of 19113985 is 58931191.

19113985 = 745² + 746² + ... + 777².

It is a happy number.

It is not a de Polignac number, because 19113985 - 2³ = 19113977 is a prime.

It is a Duffinian number.

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, 8145 + ... + 10225.

It is an arithmetic number, because the mean of its divisors is an integer number (1573992).

Almost surely, 2^19113985 is an apocalyptic number.

It is an amenable number.

19113985 is a deficient number, since it is larger than the sum of its proper divisors (6069887).

19113985 is a wasteful number, since it uses less digits than its factorization.

19113985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264.

The product of its digits is 9720, while the sum is 37.

The square root of 19113985 is about 4371.9543684718. The cubic root of 19113985 is about 267.3727114434.

The spelling of 19113985 in words is "nineteen million, one hundred thirteen thousand, nine hundred eighty-five".