31404123 has 6 divisors (see below), whose sum is σ = 45361524. Its totient is φ = 20936076.

The previous prime is 31404119. The next prime is 31404127. The reversal of 31404123 is 32140413.

It is an interprime number because it is at equal distance from previous prime (31404119) and next prime (31404127).

It is not a de Polignac number, because 31404123 - 2² = 31404119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31404096 and 31404105.

It is not an unprimeable number, because it can be changed into a prime (31404127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1744665 + ... + 1744682.

It is an arithmetic number, because the mean of its divisors is an integer number (7560254).

Almost surely, 2^31404123 is an apocalyptic number.

31404123 is a deficient number, since it is larger than the sum of its proper divisors (13957401).

31404123 is a wasteful number, since it uses less digits than its factorization.

31404123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489353 (or 3489350 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31404123 is about 5603.9381688238. The cubic root of 31404123 is about 315.4972343441.

Adding to 31404123 its reverse (32140413), we get a palindrome (63544536).

The spelling of 31404123 in words is "thirty-one million, four hundred four thousand, one hundred twenty-three".