193906 has 4 divisors (see below), whose sum is σ = 290862. Its totient is φ = 96952.
The previous prime is 193891. The next prime is 193937. The reversal of 193906 is 609391.
It is a happy number.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 128881 + 65025 = 359^2 + 255^2 .
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48475 + ... + 48478.
2193906 is an apocalyptic number.
193906 is the 279-th centered pentagonal number.
193906 is a deficient number, since it is larger than the sum of its proper divisors (96956).
193906 is an equidigital number, since it uses as much as digits as its factorization.
193906 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 96955.
The product of its (nonzero) digits is 1458, while the sum is 28.
The square root of 193906 is about 440.3475899786. The cubic root of 193906 is about 57.8802523428.
Adding to 193906 its product of nonzero digits (1458), we get a square (195364 = 4422).
The spelling of 193906 in words is "one hundred ninety-three thousand, nine hundred six".
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