181974028 has 12 divisors (see below), whose sum is σ = 322033320. Its totient is φ = 89964512.

The previous prime is 181974017. The next prime is 181974047. The reversal of 181974028 is 820479181.

It is a happy number.

It is a super-2 number, since 2×181974028² = 66229093733089568, 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, 255226 + ... + 255937.

It is an arithmetic number, because the mean of its divisors is an integer number (26836110).

Almost surely, 2^181974028 is an apocalyptic number.

It is an amenable number.

181974028 is a deficient number, since it is larger than the sum of its proper divisors (140059292).

181974028 is a wasteful number, since it uses less digits than its factorization.

181974028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511256 (or 511254 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 181974028 is about 13489.7749425259. The cubic root of 181974028 is about 566.6781526315.

The spelling of 181974028 in words is "one hundred eighty-one million, nine hundred seventy-four thousand, twenty-eight".