31400473 has 8 divisors (see below), whose sum is σ = 33928328. Its totient is φ = 28888704.

The previous prime is 31400461. The next prime is 31400491. The reversal of 31400473 is 37400413.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 797449 + 30603024 = 893^2 + 5532^2 .

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

It is not a de Polignac number, because 31400473 - 2⁵ = 31400441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31400273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211 + ... + 7927.

It is an arithmetic number, because the mean of its divisors is an integer number (4241041).

Almost surely, 2^31400473 is an apocalyptic number.

It is an amenable number.

31400473 is a deficient number, since it is larger than the sum of its proper divisors (2527855).

31400473 is a wasteful number, since it uses less digits than its factorization.

31400473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8043.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 31400473 is about 5603.6124955247. The cubic root of 31400473 is about 315.4850107950.

Adding to 31400473 its reverse (37400413), we get a palindrome (68800886).

The spelling of 31400473 in words is "thirty-one million, four hundred thousand, four hundred seventy-three".