181424690 has 32 divisors (see below), whose sum is σ = 349989120. Its totient is φ = 67535424.

The previous prime is 181424689. The next prime is 181424699. The reversal of 181424690 is 96424181.

It is a happy number.

It is a super-2 number, since 2×181424690² = 65829836283192200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 181424690.

It is not an unprimeable number, because it can be changed into a prime (181424699) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 2150 + ... + 19169.

It is an arithmetic number, because the mean of its divisors is an integer number (10937160).

Almost surely, 2^181424690 is an apocalyptic number.

181424690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181424690 is a deficient number, since it is larger than the sum of its proper divisors (168564430).

181424690 is a wasteful number, since it uses less digits than its factorization.

181424690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21386.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 181424690 is about 13469.3982790621. The cubic root of 181424690 is about 566.1073539329.

The spelling of 181424690 in words is "one hundred eighty-one million, four hundred twenty-four thousand, six hundred ninety".