233988989 has 8 divisors (see below), whose sum is σ = 252295512. Its totient is φ = 215726400.

The previous prime is 233988973. The next prime is 233989001. The reversal of 233988989 is 989889332.

It can be written as a sum of positive squares in 4 ways, for example, as 10725625 + 223263364 = 3275^2 + 14942^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 233988989 - 2⁴ = 233988973 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 (233988919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539 + ... + 21639.

It is an arithmetic number, because the mean of its divisors is an integer number (31536939).

Almost surely, 2^233988989 is an apocalyptic number.

It is an amenable number.

233988989 is a deficient number, since it is larger than the sum of its proper divisors (18306523).

233988989 is a wasteful number, since it uses less digits than its factorization.

233988989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21967.

The product of its digits is 6718464, while the sum is 59.

The square root of 233988989 is about 15296.6986307504. The cubic root of 233988989 is about 616.2143490355.

It can be divided in two parts, 233988 and 989, that multiplied together give a palindrome (231414132).

The spelling of 233988989 in words is "two hundred thirty-three million, nine hundred eighty-eight thousand, nine hundred eighty-nine".