231643340 has 24 divisors (see below), whose sum is σ = 487277952. Its totient is φ = 92499840.

The previous prime is 231643339. The next prime is 231643351. The reversal of 231643340 is 43346132.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2600 + ... + 21680.

It is an arithmetic number, because the mean of its divisors is an integer number (20303248).

Almost surely, 2^231643340 is an apocalyptic number.

231643340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231643340 is an abundant number, since it is smaller than the sum of its proper divisors (255634612).

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

231643340 is a wasteful number, since it uses less digits than its factorization.

231643340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19697 (or 19695 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 231643340 is about 15219.8337704457. The cubic root of 231643340 is about 614.1483264821.

Adding to 231643340 its reverse (43346132), we get a palindrome (274989472).

The spelling of 231643340 in words is "two hundred thirty-one million, six hundred forty-three thousand, three hundred forty".