3947405 has 16 divisors (see below), whose sum is σ = 5906304. Its totient is φ = 2460480.

The previous prime is 3947401. The next prime is 3947407. The reversal of 3947405 is 5047493.

It is not a de Polignac number, because 3947405 - 2² = 3947401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4742 + ... + 5511.

It is an arithmetic number, because the mean of its divisors is an integer number (369144).

Almost surely, 2^3947405 is an apocalyptic number.

3947405 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3947405 is a deficient number, since it is larger than the sum of its proper divisors (1958899).

3947405 is a wasteful number, since it uses less digits than its factorization.

3947405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10276.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 3947405 is about 1986.8077410761. The cubic root of 3947405 is about 158.0412886807.

The spelling of 3947405 in words is "three million, nine hundred forty-seven thousand, four hundred five".