243720890 has 32 divisors (see below), whose sum is σ = 503483904. Its totient is φ = 83208960.

The previous prime is 243720859. The next prime is 243720899. The reversal of 243720890 is 98027342.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 243720890.

It is not an unprimeable number, because it can be changed into a prime (243720899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9647 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (15733872).

Almost surely, 2^243720890 is an apocalyptic number.

243720890 is an abundant number, since it is smaller than the sum of its proper divisors (259763014).

243720890 is a wasteful number, since it uses less digits than its factorization.

243720890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14702.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 243720890 is about 15611.5627020488. The cubic root of 243720890 is about 624.6416206754.

The spelling of 243720890 in words is "two hundred forty-three million, seven hundred twenty thousand, eight hundred ninety".