19499985 has 24 divisors (see below), whose sum is σ = 35580480. Its totient is φ = 9852192.

The previous prime is 19499983. The next prime is 19500017. The reversal of 19499985 is 58999491.

It is not a de Polignac number, because 19499985 - 2¹ = 19499983 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19499983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10549 + ... + 12258.

It is an arithmetic number, because the mean of its divisors is an integer number (1482520).

Almost surely, 2^19499985 is an apocalyptic number.

19499985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19499985 is a deficient number, since it is larger than the sum of its proper divisors (16080495).

19499985 is a wasteful number, since it uses less digits than its factorization.

19499985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22837 (or 22834 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 19499985 is about 4415.8787347480. The cubic root of 19499985 is about 269.1605615888.

The spelling of 19499985 in words is "nineteen million, four hundred ninety-nine thousand, nine hundred eighty-five".