231142340 has 48 divisors (see below), whose sum is σ = 570265920. Its totient is φ = 77585280.

The previous prime is 231142339. The next prime is 231142343. The reversal of 231142340 is 43241132.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (231142343) 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, 37550 + ... + 43269.

It is an arithmetic number, because the mean of its divisors is an integer number (11880540).

Almost surely, 2^231142340 is an apocalyptic number.

231142340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231142340 is an abundant number, since it is smaller than the sum of its proper divisors (339123580).

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

231142340 is a wasteful number, since it uses less digits than its factorization.

231142340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80852 (or 80850 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 231142340 is about 15203.3660746560. The cubic root of 231142340 is about 613.7052453183.

Adding to 231142340 its reverse (43241132), we get a palindrome (274383472).

The spelling of 231142340 in words is "two hundred thirty-one million, one hundred forty-two thousand, three hundred forty".