181434730 has 16 divisors (see below), whose sum is σ = 337844520. Its totient is φ = 70071232.

The previous prime is 181434719. The next prime is 181434733. The reversal of 181434730 is 37434181.

181434730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 158231241 + 23203489 = 12579^2 + 4817^2 .

It is a super-2 number, since 2×181434730² = 65837122500345800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181434692 and 181434701.

It is not an unprimeable number, because it can be changed into a prime (181434733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312529 + ... + 313108.

Almost surely, 2^181434730 is an apocalyptic number.

181434730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181434730 is a deficient number, since it is larger than the sum of its proper divisors (156409790).

181434730 is a wasteful number, since it uses less digits than its factorization.

181434730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625673.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 181434730 is about 13469.7709705845. The cubic root of 181434730 is about 566.1177964898.

The spelling of 181434730 in words is "one hundred eighty-one million, four hundred thirty-four thousand, seven hundred thirty".