3977869 has 6 divisors (see below), whose sum is σ = 4627374. Its totient is φ = 3409560.

The previous prime is 3977867. The next prime is 3977891. The reversal of 3977869 is 9687793.

It can be written as a sum of positive squares in only one way, i.e., 3572100 + 405769 = 1890^2 + 637^2 .

It is not a de Polignac number, because 3977869 - 2¹ = 3977867 is a prime.

It is a super-2 number, since 2×3977869² = 31646883562322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 81181 = 3977869 / (3 + 9 + 7 + 7 + 8 + 6 + 9).

It is a Duffinian number.

3977869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3977863) 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, 40542 + ... + 40639.

It is an arithmetic number, because the mean of its divisors is an integer number (771229).

Almost surely, 2^3977869 is an apocalyptic number.

It is an amenable number.

3977869 is a deficient number, since it is larger than the sum of its proper divisors (649505).

3977869 is an equidigital number, since it uses as much as digits as its factorization.

3977869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81195 (or 81188 counting only the distinct ones).

The product of its digits is 571536, while the sum is 49.

The square root of 3977869 is about 1994.4595759253. The cubic root of 3977869 is about 158.4468071760.

The spelling of 3977869 in words is "three million, nine hundred seventy-seven thousand, eight hundred sixty-nine".