181413444 has 48 divisors (see below), whose sum is σ = 460958400. Its totient is φ = 55310976.

The previous prime is 181413439. The next prime is 181413461. The reversal of 181413444 is 444314181.

It is a super-2 number, since 2×181413444² = 65821675327882272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7107 + ... + 20330.

It is an arithmetic number, because the mean of its divisors is an integer number (9603300).

Almost surely, 2^181413444 is an apocalyptic number.

It is an amenable number.

181413444 is an abundant number, since it is smaller than the sum of its proper divisors (279544956).

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

181413444 is a wasteful number, since it uses less digits than its factorization.

181413444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27492 (or 27490 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 181413444 is about 13468.9808077672. The cubic root of 181413444 is about 566.0956565635.

The spelling of 181413444 in words is "one hundred eighty-one million, four hundred thirteen thousand, four hundred forty-four".