243097990 has 16 divisors (see below), whose sum is σ = 439207920. Its totient is φ = 96876640.

The previous prime is 243097973. The next prime is 243097991. The reversal of 243097990 is 99790342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243097991) 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, 42496 + ... + 47875.

It is an arithmetic number, because the mean of its divisors is an integer number (27450495).

Almost surely, 2^243097990 is an apocalyptic number.

243097990 is a deficient number, since it is larger than the sum of its proper divisors (196109930).

243097990 is a wasteful number, since it uses less digits than its factorization.

243097990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90647.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 243097990 is about 15591.5999820416. The cubic root of 243097990 is about 624.1090152374.

The spelling of 243097990 in words is "two hundred forty-three million, ninety-seven thousand, nine hundred ninety".