181828309 has 8 divisors (see below), whose sum is σ = 206121440. Its totient is φ = 159007536.

The previous prime is 181828303. The next prime is 181828321. The reversal of 181828309 is 903828181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181828309 - 2¹⁹ = 181304021 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 (181828303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367827 + ... + 368320.

It is an arithmetic number, because the mean of its divisors is an integer number (25765180).

Almost surely, 2^181828309 is an apocalyptic number.

181828309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

181828309 is a deficient number, since it is larger than the sum of its proper divisors (24293131).

181828309 is a wasteful number, since it uses less digits than its factorization.

181828309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736179.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 181828309 is about 13484.3727699882. The cubic root of 181828309 is about 566.5268529730.

The spelling of 181828309 in words is "one hundred eighty-one million, eight hundred twenty-eight thousand, three hundred nine".