199649863 has 6 divisors (see below), whose sum is σ = 232245816. Its totient is φ = 171128412.

The previous prime is 199649851. The next prime is 199649897. The reversal of 199649863 is 368946991.

It is not a de Polignac number, because 199649863 - 2²¹ = 197552711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199649803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2037195 + ... + 2037292.

It is an arithmetic number, because the mean of its divisors is an integer number (38707636).

Almost surely, 2^199649863 is an apocalyptic number.

199649863 is a deficient number, since it is larger than the sum of its proper divisors (32595953).

199649863 is an equidigital number, since it uses as much as digits as its factorization.

199649863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074501 (or 4074494 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 55.

The square root of 199649863 is about 14129.7509886056. The cubic root of 199649863 is about 584.4620793642.

The spelling of 199649863 in words is "one hundred ninety-nine million, six hundred forty-nine thousand, eight hundred sixty-three".