231439985 has 48 divisors (see below), whose sum is σ = 334886400. Its totient is φ = 153014400.

The previous prime is 231439973. The next prime is 231439987. The reversal of 231439985 is 589934132.

231439985 = 1488² + 1489² + ... + 1585².

It is not a de Polignac number, because 231439985 - 2¹⁸ = 231177841 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (231439987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1162916 + ... + 1163114.

It is an arithmetic number, because the mean of its divisors is an integer number (6976800).

Almost surely, 2^231439985 is an apocalyptic number.

It is an amenable number.

231439985 is a deficient number, since it is larger than the sum of its proper divisors (103446415).

231439985 is a wasteful number, since it uses less digits than its factorization.

231439985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 359 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The square root of 231439985 is about 15213.1517115948. The cubic root of 231439985 is about 613.9685577380.

The spelling of 231439985 in words is "two hundred thirty-one million, four hundred thirty-nine thousand, nine hundred eighty-five".