39781012 has 6 divisors (see below), whose sum is σ = 69616778. Its totient is φ = 19890504.

The previous prime is 39780997. The next prime is 39781019. The reversal of 39781012 is 21018793.

It can be written as a sum of positive squares in only one way, i.e., 39765636 + 15376 = 6306^2 + 124^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39781019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972623 + ... + 4972630.

Almost surely, 2^39781012 is an apocalyptic number.

It is an amenable number.

39781012 is a deficient number, since it is larger than the sum of its proper divisors (29835766).

39781012 is a wasteful number, since it uses less digits than its factorization.

39781012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9945257 (or 9945255 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 39781012 is about 6307.2190385304. The cubic root of 39781012 is about 341.3699399047.

The spelling of 39781012 in words is "thirty-nine million, seven hundred eighty-one thousand, twelve".