3977649 has 12 divisors (see below), whose sum is σ = 6187636. Its totient is φ = 2447712.

The previous prime is 3977647. The next prime is 3977653. The reversal of 3977649 is 9467793.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 2537649 = 1200^2 + 1593^2 .

It is not a de Polignac number, because 3977649 - 2¹ = 3977647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3977647) 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, 16882 + ... + 17115.

Almost surely, 2^3977649 is an apocalyptic number.

3977649 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

3977649 is a deficient number, since it is larger than the sum of its proper divisors (2209987).

3977649 is a wasteful number, since it uses less digits than its factorization.

3977649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34016 (or 34013 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 3977649 is about 1994.4044223778. The cubic root of 3977649 is about 158.4438861028.

The spelling of 3977649 in words is "three million, nine hundred seventy-seven thousand, six hundred forty-nine".