231206040 has 192 divisors, whose sum is σ = 817689600. Its totient is φ = 56318976.

The previous prime is 231205991. The next prime is 231206077. The reversal of 231206040 is 40602132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 594166 + ... + 594554.

It is an arithmetic number, because the mean of its divisors is an integer number (4258800).

Almost surely, 2^231206040 is an apocalyptic number.

231206040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231206040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408844800).

231206040 is an abundant number, since it is smaller than the sum of its proper divisors (586483560).

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

231206040 is a wasteful number, since it uses less digits than its factorization.

231206040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 231206040 is about 15205.4608611512. The cubic root of 231206040 is about 613.7616166917.

Adding to 231206040 its reverse (40602132), we get a palindrome (271808172).

The spelling of 231206040 in words is "two hundred thirty-one million, two hundred six thousand, forty".