181987950 has 24 divisors (see below), whose sum is σ = 451330488. Its totient is φ = 48530080.

The previous prime is 181987933. The next prime is 181987957. The reversal of 181987950 is 59789181.

It is a super-2 number, since 2×181987950² = 66239227890405000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181987950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181987957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 606477 + ... + 606776.

It is an arithmetic number, because the mean of its divisors is an integer number (18805437).

Almost surely, 2^181987950 is an apocalyptic number.

181987950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181987950 is an abundant number, since it is smaller than the sum of its proper divisors (269342538).

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

181987950 is a wasteful number, since it uses less digits than its factorization.

181987950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213268 (or 1213263 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 181987950 is about 13490.2909531263. The cubic root of 181987950 is about 566.6926035802.

The spelling of 181987950 in words is "one hundred eighty-one million, nine hundred eighty-seven thousand, nine hundred fifty".