231921406 has 16 divisors (see below), whose sum is σ = 359792640. Its totient is φ = 112053240.

The previous prime is 231921401. The next prime is 231921407. The reversal of 231921406 is 604129132.

It is a super-2 number, since 2×231921406² = 107575077122033672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231921401) 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 7 ways as a sum of consecutive naturals, for example, 8190 + ... + 23041.

It is an arithmetic number, because the mean of its divisors is an integer number (22487040).

Almost surely, 2^231921406 is an apocalyptic number.

231921406 is a deficient number, since it is larger than the sum of its proper divisors (127871234).

231921406 is a wasteful number, since it uses less digits than its factorization.

231921406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31359.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 231921406 is about 15228.9660187420. The cubic root of 231921406 is about 614.3939706140.

The spelling of 231921406 in words is "two hundred thirty-one million, nine hundred twenty-one thousand, four hundred six".