3947949 has 6 divisors (see below), whose sum is σ = 5702606. Its totient is φ = 2631960.

The previous prime is 3947941. The next prime is 3947963. The reversal of 3947949 is 9497493.

It can be written as a sum of positive squares in only one way, i.e., 2722500 + 1225449 = 1650^2 + 1107^2 .

It is not a de Polignac number, because 3947949 - 2³ = 3947941 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 (3947941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219322 + ... + 219339.

Almost surely, 2^3947949 is an apocalyptic number.

It is an amenable number.

3947949 is a deficient number, since it is larger than the sum of its proper divisors (1754657).

3947949 is a wasteful number, since it uses less digits than its factorization.

3947949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438667 (or 438664 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 3947949 is about 1986.9446393898. The cubic root of 3947949 is about 158.0485483456.

The spelling of 3947949 in words is "three million, nine hundred forty-seven thousand, nine hundred forty-nine".