181490402 has 32 divisors (see below), whose sum is σ = 299550960. Its totient is φ = 82114560.

The previous prime is 181490377. The next prime is 181490437. The reversal of 181490402 is 204094181.

It can be written as a sum of positive squares in 8 ways, for example, as 149352841 + 32137561 = 12221^2 + 5669^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111152 + ... + 112772.

Almost surely, 2^181490402 is an apocalyptic number.

181490402 is a deficient number, since it is larger than the sum of its proper divisors (118060558).

181490402 is a wasteful number, since it uses less digits than its factorization.

181490402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 181490402 is about 13471.8373654079. The cubic root of 181490402 is about 566.1756936869.

The spelling of 181490402 in words is "one hundred eighty-one million, four hundred ninety thousand, four hundred two".