231612406 has 8 divisors (see below), whose sum is σ = 353307240. Its totient is φ = 113843328.

The previous prime is 231612401. The next prime is 231612419. The reversal of 231612406 is 604216132.

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

It is a super-2 number, since 2×231612406² = 107288613226217672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231612401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981291 + ... + 981526.

It is an arithmetic number, because the mean of its divisors is an integer number (44163405).

Almost surely, 2^231612406 is an apocalyptic number.

231612406 is a deficient number, since it is larger than the sum of its proper divisors (121694834).

231612406 is a wasteful number, since it uses less digits than its factorization.

231612406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962878.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 231612406 is about 15218.8174967702. The cubic root of 231612406 is about 614.1209871681.

Adding to 231612406 its reverse (604216132), we get a palindrome (835828538).

The spelling of 231612406 in words is "two hundred thirty-one million, six hundred twelve thousand, four hundred six".