3947447493 has 24 divisors (see below), whose sum is σ = 6428049600. Its totient is φ = 2392390440.

The previous prime is 3947447489. The next prime is 3947447503.

3947447493 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3947447493 - 2² = 3947447489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947447423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 600873 + ... + 607406.

It is an arithmetic number, because the mean of its divisors is an integer number (267835400).

Almost surely, 2^3947447493 is an apocalyptic number.

3947447493 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3947447493 is a deficient number, since it is larger than the sum of its proper divisors (2480602107).

3947447493 is a wasteful number, since it uses less digits than its factorization.

3947447493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208310 (or 1208293 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 54.

The square root of 3947447493 is about 62828.7155128927. The cubic root of 3947447493 is about 1580.4185577262.

The spelling of 3947447493 in words is "three billion, nine hundred forty-seven million, four hundred forty-seven thousand, four hundred ninety-three".