146690218 has 4 divisors (see below), whose sum is σ = 220035330. Its totient is φ = 73345108.

The previous prime is 146690197. The next prime is 146690227. The reversal of 146690218 is 812096641.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812096641 = 131 ⋅6199211.

It can be written as a sum of positive squares in only one way, i.e., 145033849 + 1656369 = 12043^2 + 1287^2 .

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 as a sum of consecutive naturals, namely, 36672553 + ... + 36672556.

Almost surely, 2^146690218 is an apocalyptic number.

146690218 is a deficient number, since it is larger than the sum of its proper divisors (73345112).

146690218 is an equidigital number, since it uses as much as digits as its factorization.

146690218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73345111.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 146690218 is about 12111.5737210323. The cubic root of 146690218 is about 527.3922189442.

The spelling of 146690218 in words is "one hundred forty-six million, six hundred ninety thousand, two hundred eighteen".