31730242 has 4 divisors (see below), whose sum is σ = 47595366. Its totient is φ = 15865120.

The previous prime is 31730233. The next prime is 31730273. The reversal of 31730242 is 24203713.

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., 31460881 + 269361 = 5609^2 + 519^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7932559 + ... + 7932562.

Almost surely, 2^31730242 is an apocalyptic number.

31730242 is a deficient number, since it is larger than the sum of its proper divisors (15865124).

31730242 is a wasteful number, since it uses less digits than its factorization.

31730242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15865123.

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

The square root of 31730242 is about 5632.9603229563. The cubic root of 31730242 is about 316.5855789917.

Adding to 31730242 its reverse (24203713), we get a palindrome (55933955).

The spelling of 31730242 in words is "thirty-one million, seven hundred thirty thousand, two hundred forty-two".