243231390 has 64 divisors (see below), whose sum is σ = 650030400. Its totient is φ = 64720512.

The previous prime is 243231383. The next prime is 243231397. The reversal of 243231390 is 93132342.

It is a happy number.

243231390 is a `hidden beast` number, since 2 + 43 + 231 + 390 = 666.

It is an interprime number because it is at equal distance from previous prime (243231383) and next prime (243231397).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243231397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197296 + ... + 198524.

It is an arithmetic number, because the mean of its divisors is an integer number (10156725).

Almost surely, 2^243231390 is an apocalyptic number.

243231390 is an abundant number, since it is smaller than the sum of its proper divisors (406799010).

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

243231390 is a wasteful number, since it uses less digits than its factorization.

243231390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978 (or 1972 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 243231390 is about 15595.8773398613. The cubic root of 243231390 is about 624.2231542839.

The spelling of 243231390 in words is "two hundred forty-three million, two hundred thirty-one thousand, three hundred ninety".