181420736 has 168 divisors, whose sum is σ = 459705456. Its totient is φ = 70533120.

The previous prime is 181420727. The next prime is 181420739. The reversal of 181420736 is 637024181.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (181420739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2185751 + ... + 2185833.

It is an arithmetic number, because the mean of its divisors is an integer number (2736342).

Almost surely, 2^181420736 is an apocalyptic number.

181420736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181420736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229852728).

181420736 is an abundant number, since it is smaller than the sum of its proper divisors (278284720).

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

181420736 is a wasteful number, since it uses less digits than its factorization.

181420736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 181420736 is about 13469.2515011043. The cubic root of 181420736 is about 566.1032412902.

The spelling of 181420736 in words is "one hundred eighty-one million, four hundred twenty thousand, seven hundred thirty-six".