39978801 has 12 divisors (see below), whose sum is σ = 58837428. Its totient is φ = 26149344.

The previous prime is 39978779. The next prime is 39978821. The reversal of 39978801 is 10887993.

It can be written as a sum of positive squares in 2 ways, for example, as 33628401 + 6350400 = 5799^2 + 2520^2 .

It is a de Polignac number, because none of the positive numbers 2^k-39978801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39978821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41430 + ... + 42383.

It is an arithmetic number, because the mean of its divisors is an integer number (4903119).

Almost surely, 2^39978801 is an apocalyptic number.

It is an amenable number.

39978801 is a deficient number, since it is larger than the sum of its proper divisors (18858627).

39978801 is a wasteful number, since it uses less digits than its factorization.

39978801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83872 (or 83869 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 39978801 is about 6322.8791701250. The cubic root of 39978801 is about 341.9347623590.

The spelling of 39978801 in words is "thirty-nine million, nine hundred seventy-eight thousand, eight hundred one".