19992851 has 4 divisors (see below), whose sum is σ = 20120352. Its totient is φ = 19865352.

The previous prime is 19992829. The next prime is 19992877. The reversal of 19992851 is 15829991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19992851 - 2¹⁸ = 19730707 is a prime.

It is a super-2 number, since 2×19992851² = 799428182216402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19992881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63515 + ... + 63828.

It is an arithmetic number, because the mean of its divisors is an integer number (5030088).

Almost surely, 2^19992851 is an apocalyptic number.

19992851 is a deficient number, since it is larger than the sum of its proper divisors (127501).

19992851 is a wasteful number, since it uses less digits than its factorization.

19992851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127500.

The product of its digits is 58320, while the sum is 44.

The square root of 19992851 is about 4471.3366010624. The cubic root of 19992851 is about 271.4094155192.

The spelling of 19992851 in words is "nineteen million, nine hundred ninety-two thousand, eight hundred fifty-one".