181249890 has 32 divisors (see below), whose sum is σ = 453914496. Its totient is φ = 46231680.

The previous prime is 181249883. The next prime is 181249891. The reversal of 181249890 is 98942181.

It is not an unprimeable number, because it can be changed into a prime (181249891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130651 + ... + 132030.

It is an arithmetic number, because the mean of its divisors is an integer number (14184828).

Almost surely, 2^181249890 is an apocalyptic number.

181249890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181249890 is an abundant number, since it is smaller than the sum of its proper divisors (272664606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181249890 is a wasteful number, since it uses less digits than its factorization.

181249890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262714.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 181249890 is about 13462.9079325382. The cubic root of 181249890 is about 565.9254834954.

The spelling of 181249890 in words is "one hundred eighty-one million, two hundred forty-nine thousand, eight hundred ninety".