31405047 has 8 divisors (see below), whose sum is σ = 42130944. Its totient is φ = 20807928.

The previous prime is 31405039. The next prime is 31405063. The reversal of 31405047 is 74050413.

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

It is not a de Polignac number, because 31405047 - 2³ = 31405039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31405027) 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, 31623 + ... + 32600.

It is an arithmetic number, because the mean of its divisors is an integer number (5266368).

Almost surely, 2^31405047 is an apocalyptic number.

31405047 is a deficient number, since it is larger than the sum of its proper divisors (10725897).

31405047 is a wasteful number, since it uses less digits than its factorization.

31405047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64389.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 31405047 is about 5604.0206102405. The cubic root of 31405047 is about 315.5003285937.

The spelling of 31405047 in words is "thirty-one million, four hundred five thousand, forty-seven".