31447742 has 4 divisors (see below), whose sum is σ = 47171616. Its totient is φ = 15723870.

The previous prime is 31447681. The next prime is 31447751. The reversal of 31447742 is 24774413.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 31447699 and 31447708.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7861934 + ... + 7861937.

It is an arithmetic number, because the mean of its divisors is an integer number (11792904).

Almost surely, 2^31447742 is an apocalyptic number.

31447742 is a deficient number, since it is larger than the sum of its proper divisors (15723874).

31447742 is a wasteful number, since it uses less digits than its factorization.

31447742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15723873.

The product of its digits is 18816, while the sum is 32.

The square root of 31447742 is about 5607.8286350423. The cubic root of 31447742 is about 315.6432375437.

The spelling of 31447742 in words is "thirty-one million, four hundred forty-seven thousand, seven hundred forty-two".