3987305 has 16 divisors (see below), whose sum is σ = 5617920. Its totient is φ = 2659392.

The previous prime is 3987301. The next prime is 3987311. The reversal of 3987305 is 5037893.

It is a cyclic number.

It is not a de Polignac number, because 3987305 - 2² = 3987301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3987301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245 + ... + 2834.

It is an arithmetic number, because the mean of its divisors is an integer number (351120).

Almost surely, 2^3987305 is an apocalyptic number.

3987305 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3987305 is a deficient number, since it is larger than the sum of its proper divisors (1630615).

3987305 is a wasteful number, since it uses less digits than its factorization.

3987305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 3987305 is about 1996.8237278238. The cubic root of 3987305 is about 158.5719934200.

The spelling of 3987305 in words is "three million, nine hundred eighty-seven thousand, three hundred five".