3994409954404 has 27 divisors (see below), whose sum is σ = 7030324154763. Its totient is φ = 1985810947200.

The previous prime is 3994409954401. The next prime is 3994409954543. The reversal of 3994409954404 is 4044599044993.

The square root of 3994409954404 is 1998602.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2475895956004 + 1518513998400 = 1573498^2 + 1232280^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3994409954401) 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, 723491164 + ... + 723496684.

Almost surely, 2^{3994409954404} is an apocalyptic number.

3994409954404 is the 1998602-nd square number.

It is an amenable number.

3994409954404 is a deficient number, since it is larger than the sum of its proper divisors (3035914200359).

3994409954404 is an frugal number, since it uses more digits than its factorization.

3994409954404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11408 (or 5704 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 64.

Multiplying 3994409954404 by its sum of digits (64), we get a square (255642237081856 = 15988816²).

The spelling of 3994409954404 in words is "three trillion, nine hundred ninety-four billion, four hundred nine million, nine hundred fifty-four thousand, four hundred four".