181939950 has 108 divisors (see below), whose sum is σ = 519628200. Its totient is φ = 45630720.

The previous prime is 181939949. The next prime is 181939951. The reversal of 181939950 is 59939181.

It is an interprime number because it is at equal distance from previous prime (181939949) and next prime (181939951).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 181939896 and 181939905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181939951) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 129351 + ... + 130749.

Almost surely, 2^181939950 is an apocalyptic number.

181939950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 181939950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259814100).

181939950 is an abundant number, since it is smaller than the sum of its proper divisors (337688250).

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

181939950 is a wasteful number, since it uses less digits than its factorization.

181939950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451 (or 1426 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 181939950 is about 13488.5117785470. The cubic root of 181939950 is about 566.6427767706.

The spelling of 181939950 in words is "one hundred eighty-one million, nine hundred thirty-nine thousand, nine hundred fifty".