231478140 has 48 divisors (see below), whose sum is σ = 682254720. Its totient is φ = 58478400.

The previous prime is 231478133. The next prime is 231478151. The reversal of 231478140 is 41874132.

231478140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 231478098 and 231478107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100386 + ... + 102665.

It is an arithmetic number, because the mean of its divisors is an integer number (14213640).

Almost surely, 2^231478140 is an apocalyptic number.

231478140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231478140 is an abundant number, since it is smaller than the sum of its proper divisors (450776580).

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

231478140 is a wasteful number, since it uses less digits than its factorization.

231478140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203082 (or 203080 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 231478140 is about 15214.4056735713. The cubic root of 231478140 is about 614.0022953297.

The spelling of 231478140 in words is "two hundred thirty-one million, four hundred seventy-eight thousand, one hundred forty".