181229420 has 24 divisors (see below), whose sum is σ = 397129824. Its totient is φ = 69339776.

The previous prime is 181229413. The next prime is 181229449. The reversal of 181229420 is 24922181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196529 + ... + 197448.

It is an arithmetic number, because the mean of its divisors is an integer number (16547076).

Almost surely, 2^181229420 is an apocalyptic number.

181229420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181229420 is an abundant number, since it is smaller than the sum of its proper divisors (215900404).

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

181229420 is a wasteful number, since it uses less digits than its factorization.

181229420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394009 (or 394007 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 181229420 is about 13462.1476741269. The cubic root of 181229420 is about 565.9041778626.

The spelling of 181229420 in words is "one hundred eighty-one million, two hundred twenty-nine thousand, four hundred twenty".