181949420 has 24 divisors (see below), whose sum is σ = 382357584. Its totient is φ = 72729536.

The previous prime is 181949407. The next prime is 181949429. The reversal of 181949420 is 24949181.

It is not an unprimeable number, because it can be changed into a prime (181949429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43334 + ... + 47346.

It is an arithmetic number, because the mean of its divisors is an integer number (15931566).

Almost surely, 2^181949420 is an apocalyptic number.

181949420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181949420 is an abundant number, since it is smaller than the sum of its proper divisors (200408164).

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

181949420 is a wasteful number, since it uses less digits than its factorization.

181949420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6289 (or 6287 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 181949420 is about 13488.8628134472. The cubic root of 181949420 is about 566.6526078788.

The spelling of 181949420 in words is "one hundred eighty-one million, nine hundred forty-nine thousand, four hundred twenty".