243987925 has 12 divisors (see below), whose sum is σ = 309925476. Its totient is φ = 190428800.

The previous prime is 243987917. The next prime is 243987929. The reversal of 243987925 is 529789342.

It can be written as a sum of positive squares in 6 ways, for example, as 79584241 + 164403684 = 8921^2 + 12822^2 .

It is not a de Polignac number, because 243987925 - 2³ = 243987917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243987929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117994 + ... + 120043.

It is an arithmetic number, because the mean of its divisors is an integer number (25827123).

Almost surely, 2^243987925 is an apocalyptic number.

243987925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243987925 is a deficient number, since it is larger than the sum of its proper divisors (65937551).

243987925 is a wasteful number, since it uses less digits than its factorization.

243987925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238088 (or 238083 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The square root of 243987925 is about 15620.1128357000. The cubic root of 243987925 is about 624.8696688239.

It can be divided in two parts, 24398 and 7925, that added together give a palindrome (32323).

The spelling of 243987925 in words is "two hundred forty-three million, nine hundred eighty-seven thousand, nine hundred twenty-five".