31785345 has 16 divisors (see below), whose sum is σ = 56507520. Its totient is φ = 16952112.

The previous prime is 31785343. The next prime is 31785353. The reversal of 31785345 is 54358713.

It is not a de Polignac number, because 31785345 - 2¹ = 31785343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31785343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117589 + ... + 117858.

It is an arithmetic number, because the mean of its divisors is an integer number (3531720).

Almost surely, 2^31785345 is an apocalyptic number.

It is an amenable number.

31785345 is a deficient number, since it is larger than the sum of its proper divisors (24722175).

31785345 is a wasteful number, since it uses less digits than its factorization.

31785345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235461 (or 235455 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 31785345 is about 5637.8493239887. The cubic root of 31785345 is about 316.7687347187.

The spelling of 31785345 in words is "thirty-one million, seven hundred eighty-five thousand, three hundred forty-five".