199964 has 6 divisors (see below), whose sum is σ = 349944. Its totient is φ = 99980.

The previous prime is 199961. The next prime is 199967. The reversal of 199964 is 469991.

It is an interprime number because it is at equal distance from previous prime (199961) and next prime (199967).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24992 + ... + 24999.

It is an arithmetic number, because the mean of its divisors is an integer number (58324).

2¹⁹⁹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

199964 is a deficient number, since it is larger than the sum of its proper divisors (149980).

199964 is a wasteful number, since it uses less digits than its factorization.

199964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49995 (or 49993 counting only the distinct ones).

The product of its digits is 17496, while the sum is 38.

The square root of 199964 is about 447.1733444650. The cubic root of 199964 is about 58.4768457324.

Adding to 199964 its sum of digits (38), we get a palindrome (200002).

The spelling of 199964 in words is "one hundred ninety-nine thousand, nine hundred sixty-four".