231408 has 30 divisors (see below), whose sum is σ = 648024. Its totient is φ = 77088.

The previous prime is 231379. The next prime is 231409. The reversal of 231408 is 804132.

It is a happy number.

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

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 660 + ... + 947.

2²³¹⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

231408 is an abundant number, since it is smaller than the sum of its proper divisors (416616).

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

231408 is a wasteful number, since it uses less digits than its factorization.

231408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621 (or 1612 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 231408 is about 481.0488540679. The cubic root of 231408 is about 61.3940272955.

It can be divided in two parts, 23 and 1408, that added together give a triangular number (1431 = T₅₃).

The spelling of 231408 in words is "two hundred thirty-one thousand, four hundred eight".