31447042 has 32 divisors (see below), whose sum is σ = 55676160. Its totient is φ = 13159680.

The previous prime is 31447027. The next prime is 31447043. The reversal of 31447042 is 24074413.

It is a junction number, because it is equal to n+sod(n) for n = 31446998 and 31447016.

It is not an unprimeable number, because it can be changed into a prime (31447043) 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 15 ways as a sum of consecutive naturals, for example, 16684 + ... + 18472.

It is an arithmetic number, because the mean of its divisors is an integer number (1739880).

Almost surely, 2^31447042 is an apocalyptic number.

31447042 is a deficient number, since it is larger than the sum of its proper divisors (24229118).

31447042 is a wasteful number, since it uses less digits than its factorization.

31447042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 31447042 is about 5607.7662219461. The cubic root of 31447042 is about 315.6408955429.

The spelling of 31447042 in words is "thirty-one million, four hundred forty-seven thousand, forty-two".