39628961 has 4 divisors (see below), whose sum is σ = 40700052. Its totient is φ = 38557872.

The previous prime is 39628951. The next prime is 39629011. The reversal of 39628961 is 16982693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35628961 + 4000000 = 5969^2 + 2000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39628961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39628951) 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 in 3 ways as a sum of consecutive naturals, for example, 535490 + ... + 535563.

It is an arithmetic number, because the mean of its divisors is an integer number (10175013).

Almost surely, 2^39628961 is an apocalyptic number.

It is an amenable number.

39628961 is a deficient number, since it is larger than the sum of its proper divisors (1071091).

39628961 is a wasteful number, since it uses less digits than its factorization.

39628961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071090.

The product of its digits is 139968, while the sum is 44.

The square root of 39628961 is about 6295.1537709575. The cubic root of 39628961 is about 340.9344564905.

The spelling of 39628961 in words is "thirty-nine million, six hundred twenty-eight thousand, nine hundred sixty-one".