3987513 has 6 divisors (see below), whose sum is σ = 5759754. Its totient is φ = 2658336.

The previous prime is 3987481. The next prime is 3987517. The reversal of 3987513 is 3157893.

It can be written as a sum of positive squares in only one way, i.e., 2518569 + 1468944 = 1587^2 + 1212^2 .

It is not a de Polignac number, because 3987513 - 2⁵ = 3987481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3987517) 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, 221520 + ... + 221537.

It is an arithmetic number, because the mean of its divisors is an integer number (959959).

Almost surely, 2^3987513 is an apocalyptic number.

It is an amenable number.

3987513 is a deficient number, since it is larger than the sum of its proper divisors (1772241).

3987513 is a wasteful number, since it uses less digits than its factorization.

3987513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443063 (or 443060 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 3987513 is about 1996.8758098590. The cubic root of 3987513 is about 158.5747507043.

The spelling of 3987513 in words is "three million, nine hundred eighty-seven thousand, five hundred thirteen".