231667986 has 16 divisors (see below), whose sum is σ = 505457568. Its totient is φ = 70202400.

The previous prime is 231667981. The next prime is 231668009. The reversal of 231667986 is 689766132.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231667981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1754995 + ... + 1755126.

It is an arithmetic number, because the mean of its divisors is an integer number (31591098).

Almost surely, 2^231667986 is an apocalyptic number.

231667986 is an abundant number, since it is smaller than the sum of its proper divisors (273789582).

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

231667986 is a wasteful number, since it uses less digits than its factorization.

231667986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510137.

The product of its digits is 653184, while the sum is 48.

The square root of 231667986 is about 15220.6434160978. The cubic root of 231667986 is about 614.1701067513.

The spelling of 231667986 in words is "two hundred thirty-one million, six hundred sixty-seven thousand, nine hundred eighty-six".