231140420 has 48 divisors (see below), whose sum is σ = 565221888. Its totient is φ = 77750400.

The previous prime is 231140417. The next prime is 231140423. The reversal of 231140420 is 24041132.

231140420 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231140417) and next prime (231140423).

It is not an unprimeable number, because it can be changed into a prime (231140423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8156 + ... + 22995.

It is an arithmetic number, because the mean of its divisors is an integer number (11775456).

Almost surely, 2^231140420 is an apocalyptic number.

231140420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231140420 is an abundant number, since it is smaller than the sum of its proper divisors (334081468).

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

231140420 is a wasteful number, since it uses less digits than its factorization.

231140420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31220 (or 31218 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 231140420 is about 15203.3029306135. The cubic root of 231140420 is about 613.7035460518.

Adding to 231140420 its reverse (24041132), we get a palindrome (255181552).

The spelling of 231140420 in words is "two hundred thirty-one million, one hundred forty thousand, four hundred twenty".