39681436804 has 27 divisors (see below), whose sum is σ = 70195850487. Its totient is φ = 19627771464.

The previous prime is 39681436799. The next prime is 39681436807. The reversal of 39681436804 is 40863418693.

The square root of 39681436804 is 199202.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39681436807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41035129 + ... + 41036095.

Almost surely, 2^39681436804 is an apocalyptic number.

39681436804 is the 199202-nd square number.

It is an amenable number.

39681436804 is a deficient number, since it is larger than the sum of its proper divisors (30514413683).

39681436804 is an frugal number, since it uses more digits than its factorization.

39681436804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 39681436804 in words is "thirty-nine billion, six hundred eighty-one million, four hundred thirty-six thousand, eight hundred four".