231278393 has 8 divisors (see below), whose sum is σ = 251846400. Its totient is φ = 211549968.

The previous prime is 231278293. The next prime is 231278401. The reversal of 231278393 is 393872132.

It is a happy number.

231278393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231278393 - 2⁸ = 231278137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231278293) 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, 209321 + ... + 210422.

It is an arithmetic number, because the mean of its divisors is an integer number (31480800).

Almost surely, 2^231278393 is an apocalyptic number.

It is an amenable number.

231278393 is a deficient number, since it is larger than the sum of its proper divisors (20568007).

231278393 is a wasteful number, since it uses less digits than its factorization.

231278393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419791.

The product of its digits is 54432, while the sum is 38.

The square root of 231278393 is about 15207.8398531810. The cubic root of 231278393 is about 613.8256329876.

The spelling of 231278393 in words is "two hundred thirty-one million, two hundred seventy-eight thousand, three hundred ninety-three".