3987637 has 4 divisors (see below), whose sum is σ = 4003776. Its totient is φ = 3971500.

The previous prime is 3987629. The next prime is 3987649. The reversal of 3987637 is 7367893.

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 3987637 - 2³ = 3987629 is a prime.

It is a d-powerful number, because it can be written as 3³ + 9² + 8⁷ + 7⁵ + 6⁸ + 3¹¹ + 7⁵ .

It is a Duffinian number.

3987637 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3987593 and 3987602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7693 + ... + 8194.

It is an arithmetic number, because the mean of its divisors is an integer number (1000944).

Almost surely, 2^3987637 is an apocalyptic number.

It is an amenable number.

3987637 is a deficient number, since it is larger than the sum of its proper divisors (16139).

3987637 is a wasteful number, since it uses less digits than its factorization.

3987637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16138.

The product of its digits is 190512, while the sum is 43.

The square root of 3987637 is about 1996.9068581183. The cubic root of 3987637 is about 158.5763944244.

It can be divided in two parts, 3987 and 637, that added together give a square (4624 = 68²).

The spelling of 3987637 in words is "three million, nine hundred eighty-seven thousand, six hundred thirty-seven".