243399156 has 192 divisors, whose sum is σ = 796594176. Its totient is φ = 55756800.

The previous prime is 243399103. The next prime is 243399157. The reversal of 243399156 is 651993342.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243399157) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 275836 + ... + 276716.

It is an arithmetic number, because the mean of its divisors is an integer number (4148928).

Almost surely, 2^243399156 is an apocalyptic number.

243399156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243399156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398297088).

243399156 is an abundant number, since it is smaller than the sum of its proper divisors (553195020).

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

243399156 is a wasteful number, since it uses less digits than its factorization.

243399156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 940 counting only the distinct ones).

The product of its digits is 174960, while the sum is 42.

The square root of 243399156 is about 15601.2549495225. The cubic root of 243399156 is about 624.3666381679.

It can be divided in two parts, 243399 and 156, that multiplied together give a square (37970244 = 6162²).

The spelling of 243399156 in words is "two hundred forty-three million, three hundred ninety-nine thousand, one hundred fifty-six".