3994536447 has 12 divisors (see below), whose sum is σ = 6294421224. Its totient is φ = 2420931120.

The previous prime is 3994536443. The next prime is 3994536463. The reversal of 3994536447 is 7446354993.

It is a happy number.

3994536447 is a `hidden beast` number, since 3 + 99 + 453 + 64 + 47 = 666.

It is not a de Polignac number, because 3994536447 - 2² = 3994536443 is a prime.

It is a super-2 number, since 2×3994536447² = 31912642852822767618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3994536393 and 3994536402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994536443) 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, 20174328 + ... + 20174525.

It is an arithmetic number, because the mean of its divisors is an integer number (524535102).

Almost surely, 2^3994536447 is an apocalyptic number.

3994536447 is a deficient number, since it is larger than the sum of its proper divisors (2299884777).

3994536447 is a wasteful number, since it uses less digits than its factorization.

3994536447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40348870 (or 40348867 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 54.

The square root of 3994536447 is about 63202.3452650295. The cubic root of 3994536447 is about 1586.6779851771.

The spelling of 3994536447 in words is "three billion, nine hundred ninety-four million, five hundred thirty-six thousand, four hundred forty-seven".