231405885 has 12 divisors (see below), whose sum is σ = 401103612. Its totient is φ = 123416448.

The previous prime is 231405871. The next prime is 231405893. The reversal of 231405885 is 588504132.

It is a happy number.

231405885 is a `hidden beast` number, since 2 + 31 + 40 + 588 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 116251524 + 115154361 = 10782^2 + 10731^2 .

It is not a de Polignac number, because 231405885 - 2⁴ = 231405869 is a prime.

It is a super-2 number, since 2×231405885² = 107097367225266450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2571132 + ... + 2571221.

It is an arithmetic number, because the mean of its divisors is an integer number (33425301).

Almost surely, 2^231405885 is an apocalyptic number.

It is an amenable number.

231405885 is a deficient number, since it is larger than the sum of its proper divisors (169697727).

231405885 is a wasteful number, since it uses less digits than its factorization.

231405885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142364 (or 5142361 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 231405885 is about 15212.0309294979. The cubic root of 231405885 is about 613.9384025394.

The spelling of 231405885 in words is "two hundred thirty-one million, four hundred five thousand, eight hundred eighty-five".