199323509 has 32 divisors (see below), whose sum is σ = 268047360. Its totient is φ = 143510400.

The previous prime is 199323503. The next prime is 199323511. The reversal of 199323509 is 905323991.

It is a happy number.

It is not a de Polignac number, because 199323509 - 2⁴ = 199323493 is a prime.

It is a super-2 number, since 2×199323509² = 79459722480146162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199323503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58322 + ... + 61644.

It is an arithmetic number, because the mean of its divisors is an integer number (8376480).

Almost surely, 2^199323509 is an apocalyptic number.

199323509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

199323509 is a deficient number, since it is larger than the sum of its proper divisors (68723851).

199323509 is a wasteful number, since it uses less digits than its factorization.

199323509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 199323509 is about 14118.1977957528. The cubic root of 199323509 is about 584.1434455991.

The spelling of 199323509 in words is "one hundred ninety-nine million, three hundred twenty-three thousand, five hundred nine".