31440204 has 24 divisors (see below), whose sum is σ = 81511920. Its totient is φ = 10480032.

The previous prime is 31440197. The next prime is 31440217. The reversal of 31440204 is 40204413.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145449 + ... + 145664.

It is an arithmetic number, because the mean of its divisors is an integer number (3396330).

Almost surely, 2^31440204 is an apocalyptic number.

It is an amenable number.

31440204 is an abundant number, since it is smaller than the sum of its proper divisors (50071716).

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

31440204 is a wasteful number, since it uses less digits than its factorization.

31440204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291126 (or 291118 counting only the distinct ones).

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

The square root of 31440204 is about 5607.1564986185. The cubic root of 31440204 is about 315.6180157132.

Adding to 31440204 its reverse (40204413), we get a palindrome (71644617).

The spelling of 31440204 in words is "thirty-one million, four hundred forty thousand, two hundred four".