3997777 has 4 divisors (see below), whose sum is σ = 4568896. Its totient is φ = 3426660.

The previous prime is 3997769. The next prime is 3997801. The reversal of 3997777 is 7777993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3997777 - 2³ = 3997769 is a prime.

It is a Duffinian number.

3997777 is a modest number, since divided by 7777 gives 399 as remainder.

3997777 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3997777.

It is not an unprimeable number, because it can be changed into a prime (3997577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285549 + ... + 285562.

It is an arithmetic number, because the mean of its divisors is an integer number (1142224).

Almost surely, 2^3997777 is an apocalyptic number.

It is an amenable number.

3997777 is a deficient number, since it is larger than the sum of its proper divisors (571119).

3997777 is an equidigital number, since it uses as much as digits as its factorization.

3997777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571118.

The product of its digits is 583443, while the sum is 49.

The square root of 3997777 is about 1999.4441727640. Note that the first 3 decimals coincide. The cubic root of 3997777 is about 158.7106931431.

It can be divided in two parts, 3997 and 777, that added together give a palindrome (4774).

The spelling of 3997777 in words is "three million, nine hundred ninety-seven thousand, seven hundred seventy-seven".