31380705 has 24 divisors (see below), whose sum is σ = 54536040. Its totient is φ = 16692480.

The previous prime is 31380683. The next prime is 31380709. The reversal of 31380705 is 50708313.

It can be written as a sum of positive squares in 4 ways, for example, as 5645376 + 25735329 = 2376^2 + 5073^2 .

It is not a de Polignac number, because 31380705 - 2¹³ = 31372513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23701 + ... + 24989.

It is an arithmetic number, because the mean of its divisors is an integer number (2272335).

Almost surely, 2^31380705 is an apocalyptic number.

It is an amenable number.

31380705 is a deficient number, since it is larger than the sum of its proper divisors (23155335).

31380705 is a wasteful number, since it uses less digits than its factorization.

31380705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 31380705 is about 5601.8483556769. The cubic root of 31380705 is about 315.4187929297.

It can be divided in two parts, 313 and 80705, that added together give a palindrome (81018).

The spelling of 31380705 in words is "thirty-one million, three hundred eighty thousand, seven hundred five".