31403223 has 24 divisors (see below), whose sum is σ = 46303920. Its totient is φ = 20505600.

The previous prime is 31403173. The next prime is 31403249. The reversal of 31403223 is 32230413.

It is not a de Polignac number, because 31403223 - 2⁶ = 31403159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31403196 and 31403205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31403263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162615 + ... + 162807.

It is an arithmetic number, because the mean of its divisors is an integer number (1929330).

Almost surely, 2^31403223 is an apocalyptic number.

31403223 is a deficient number, since it is larger than the sum of its proper divisors (14900697).

31403223 is a wasteful number, since it uses less digits than its factorization.

31403223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 31403223 is about 5603.8578675766. The cubic root of 31403223 is about 315.4942204063.

Adding to 31403223 its reverse (32230413), we get a palindrome (63633636).

It can be divided in two parts, 31403 and 223, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 31403223 in words is "thirty-one million, four hundred three thousand, two hundred twenty-three".