243969390 has 48 divisors (see below), whose sum is σ = 724939488. Its totient is φ = 55764288.

The previous prime is 243969389. The next prime is 243969391. The reversal of 243969390 is 93969342.

It is an interprime number because it is at equal distance from previous prime (243969389) and next prime (243969391).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243969391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192997 + ... + 194256.

It is an arithmetic number, because the mean of its divisors is an integer number (15102906).

Almost surely, 2^243969390 is an apocalyptic number.

243969390 is an abundant number, since it is smaller than the sum of its proper divisors (480970098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243969390 is a wasteful number, since it uses less digits than its factorization.

243969390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387273 (or 387270 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 45.

The square root of 243969390 is about 15619.5195188584. The cubic root of 243969390 is about 624.8538452914.

The spelling of 243969390 in words is "two hundred forty-three million, nine hundred sixty-nine thousand, three hundred ninety".