31427042 has 4 divisors (see below), whose sum is σ = 47140566. Its totient is φ = 15713520.

The previous prime is 31427027. The next prime is 31427089. The reversal of 31427042 is 24072413.

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

It can be written as a sum of positive squares in only one way, i.e., 15832441 + 15594601 = 3979^2 + 3949^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31426999 and 31427017.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7856759 + ... + 7856762.

Almost surely, 2^31427042 is an apocalyptic number.

31427042 is a deficient number, since it is larger than the sum of its proper divisors (15713524).

31427042 is a wasteful number, since it uses less digits than its factorization.

31427042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15713523.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 31427042 is about 5605.9826970835. The cubic root of 31427042 is about 315.5739665487.

Adding to 31427042 its reverse (24072413), we get a palindrome (55499455).

The spelling of 31427042 in words is "thirty-one million, four hundred twenty-seven thousand, forty-two".