233531406 has 12 divisors (see below), whose sum is σ = 505984752. Its totient is φ = 77843796.

The previous prime is 233531387. The next prime is 233531407. The reversal of 233531406 is 604135332.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 233531406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233531407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6486966 + ... + 6487001.

It is an arithmetic number, because the mean of its divisors is an integer number (42165396).

Almost surely, 2^233531406 is an apocalyptic number.

233531406 is an abundant number, since it is smaller than the sum of its proper divisors (272453346).

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

233531406 is a wasteful number, since it uses less digits than its factorization.

233531406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973975 (or 12973972 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 233531406 is about 15281.7343910958. The cubic root of 233531406 is about 615.8124024658.

Adding to 233531406 its reverse (604135332), we get a palindrome (837666738).

The spelling of 233531406 in words is "two hundred thirty-three million, five hundred thirty-one thousand, four hundred six".