31404242 has 8 divisors (see below), whose sum is σ = 47209932. Its totient is φ = 15667600.

The previous prime is 31404211. The next prime is 31404251. The reversal of 31404242 is 24240413.

It can be written as a sum of positive squares in 2 ways, for example, as 24690961 + 6713281 = 4969^2 + 2591^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16109 + ... + 17952.

Almost surely, 2^31404242 is an apocalyptic number.

31404242 is a deficient number, since it is larger than the sum of its proper divisors (15805690).

31404242 is a wasteful number, since it uses less digits than its factorization.

31404242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34524.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 31404242 is about 5603.9487863470. The cubic root of 31404242 is about 315.4976328493.

Adding to 31404242 its reverse (24240413), we get a palindrome (55644655).

The spelling of 31404242 in words is "thirty-one million, four hundred four thousand, two hundred forty-two".