243390146 has 4 divisors (see below), whose sum is σ = 365085222. Its totient is φ = 121695072.

The previous prime is 243390143. The next prime is 243390193. The reversal of 243390146 is 641093342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641093342 = 2 ⋅320546671.

It can be written as a sum of positive squares in only one way, i.e., 215943025 + 27447121 = 14695^2 + 5239^2 .

It is not an unprimeable number, because it can be changed into a prime (243390143) by changing a digit.

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, 60847535 + ... + 60847538.

Almost surely, 2^243390146 is an apocalyptic number.

243390146 is a deficient number, since it is larger than the sum of its proper divisors (121695076).

243390146 is a wasteful number, since it uses less digits than its factorization.

243390146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121695075.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 243390146 is about 15600.9661880282. The cubic root of 243390146 is about 624.3589339330.

The spelling of 243390146 in words is "two hundred forty-three million, three hundred ninety thousand, one hundred forty-six".