181389004 has 12 divisors (see below), whose sum is σ = 317530584. Its totient is φ = 90665984.

The previous prime is 181388983. The next prime is 181389011. The reversal of 181389004 is 400983181.

It is a happy number.

It is a super-2 number, since 2×181389004² = 65803941544224032, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14412 + ... + 23884.

It is an arithmetic number, because the mean of its divisors is an integer number (26460882).

Almost surely, 2^181389004 is an apocalyptic number.

It is an amenable number.

181389004 is a deficient number, since it is larger than the sum of its proper divisors (136141580).

181389004 is a wasteful number, since it uses less digits than its factorization.

181389004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14264 (or 14262 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 181389004 is about 13468.0735073729. The cubic root of 181389004 is about 566.0702339728.

The spelling of 181389004 in words is "one hundred eighty-one million, three hundred eighty-nine thousand, four".