31204242 has 12 divisors (see below), whose sum is σ = 67609230. Its totient is φ = 10401408.

The previous prime is 31204237. The next prime is 31204267. The reversal of 31204242 is 24240213.

It can be written as a sum of positive squares in only one way, i.e., 29713401 + 1490841 = 5451^2 + 1221^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1733569 = 31204242 / (3 + 1 + 2 + 0 + 4 + 2 + 4 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 866767 + ... + 866802.

Almost surely, 2^31204242 is an apocalyptic number.

31204242 is an abundant number, since it is smaller than the sum of its proper divisors (36404988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31204242 is a wasteful number, since it uses less digits than its factorization.

31204242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733577 (or 1733574 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 31204242 is about 5586.0757245136. The cubic root of 31204242 is about 314.8264501293.

Adding to 31204242 its reverse (24240213), we get a palindrome (55444455).

The spelling of 31204242 in words is "thirty-one million, two hundred four thousand, two hundred forty-two".