399780925018 has 4 divisors (see below), whose sum is σ = 599671387530. Its totient is φ = 199890462508.

The previous prime is 399780925007. The next prime is 399780925067. The reversal of 399780925018 is 810529087993.

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

It can be written as a sum of positive squares in only one way, i.e., 322422959329 + 77357965689 = 567823^2 + 278133^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99945231253 + ... + 99945231256.

Almost surely, 2^399780925018 is an apocalyptic number.

399780925018 is a deficient number, since it is larger than the sum of its proper divisors (199890462512).

399780925018 is a wasteful number, since it uses less digits than its factorization.

399780925018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199890462511.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 399780925018 in words is "three hundred ninety-nine billion, seven hundred eighty million, nine hundred twenty-five thousand, eighteen".