39784961 has 2 divisors, whose sum is σ = 39784962. Its totient is φ = 39784960.

The previous prime is 39784949. The next prime is 39784991. The reversal of 39784961 is 16948793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 12117361 = 5260^2 + 3481^2 .

It is an emirp because it is prime and its reverse (16948793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39784961 - 2¹⁰ = 39783937 is a prime.

It is not a weakly prime, because it can be changed into another prime (39784931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19892480 + 19892481.

It is an arithmetic number, because the mean of its divisors is an integer number (19892481).

Almost surely, 2^39784961 is an apocalyptic number.

It is an amenable number.

39784961 is a deficient number, since it is larger than the sum of its proper divisors (1).

39784961 is an equidigital number, since it uses as much as digits as its factorization.

39784961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 39784961 is about 6307.5320847381. The cubic root of 39784961 is about 341.3812352876.

It can be divided in two parts, 397 and 84961, that added together give a palindrome (85358).

The spelling of 39784961 in words is "thirty-nine million, seven hundred eighty-four thousand, nine hundred sixty-one".