31440023434 has 4 divisors (see below), whose sum is σ = 47160035154. Its totient is φ = 15720011716.

The previous prime is 31440023389. The next prime is 31440023467. The reversal of 31440023434 is 43432004413.

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., 24506963209 + 6933060225 = 156547^2 + 83265^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860005857 + ... + 7860005860.

Almost surely, 2^31440023434 is an apocalyptic number.

31440023434 is a deficient number, since it is larger than the sum of its proper divisors (15720011720).

31440023434 is a wasteful number, since it uses less digits than its factorization.

31440023434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15720011719.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 31440023434 its reverse (43432004413), we get a palindrome (74872027847).

The spelling of 31440023434 in words is "thirty-one billion, four hundred forty million, twenty-three thousand, four hundred thirty-four".