19992985 has 8 divisors (see below), whose sum is σ = 24765696. Its totient is φ = 15478320.

The previous prime is 19992971. The next prime is 19992991. The reversal of 19992985 is 58929991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19992985 - 2¹¹ = 19990937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64339 + ... + 64648.

It is an arithmetic number, because the mean of its divisors is an integer number (3095712).

Almost surely, 2^19992985 is an apocalyptic number.

It is an amenable number.

19992985 is a deficient number, since it is larger than the sum of its proper divisors (4772711).

19992985 is a wasteful number, since it uses less digits than its factorization.

19992985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129023.

The product of its digits is 524880, while the sum is 52.

The square root of 19992985 is about 4471.3515853710. The cubic root of 19992985 is about 271.4100218823.

The spelling of 19992985 in words is "nineteen million, nine hundred ninety-two thousand, nine hundred eighty-five".